fix: add #include <stdbool.h> and parentheses (AEGHB-1143)

[MarcioBulla]

Description

This pull request fixes compilation errors in the espressif__knob component.

The Clang compiler was producing errors due to incorrect use of the logical NOT operator ! applied directly before a comparison (== 0), which caused ambiguity and warnings treated as errors.

To resolve this, parentheses were added around the expression to clarify the intended logic. Additionally, the <stdbool.h> header was included in iot_knob.h to properly define the bool type, which was previously causing an unknown type error during compilation.

---

Related

No specific open issues related to this PR.
This PR addresses build errors that prevented using the espressif__knob component with recent versions of Clang (esp-clang version esp-18.1.2_20240912).

---

Testing

The firmware was compiled locally using the ESP-IDF toolchain with Clang 18.1.2 without any compilation errors.
The functionality of the espressif__knob component was tested in the application and behaved as expected.

---

Checklist

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GitHub Actions) pass.
• Documentation is updated as needed (not applicable for this fix).
• Tests are updated or added if necessary (not applicable).
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are concise and minimal.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

	Fails
🚫	node failed.

Log

┌─────────┬─────────────────────────────────────┬───────────────────────────────────────────────────────┬────────────────┐
│ (index) │             CiVariable              │                         Value                         │ CustomSettings │
├─────────┼─────────────────────────────────────┼───────────────────────────────────────────────────────┼────────────────┤
│    0    │  'ENABLE_RULE_PR_COMMIT_MESSAGES'   │                         true                          │   'default'    │
│    1    │    'ENABLE_RULE_PR_DESCRIPTION'     │                         true                          │   'default'    │
│    2    │     'ENABLE_RULE_PR_SIZE_LINES'     │                         true                          │   'default'    │
│    3    │ 'ENABLE_RULE_PR_SOURCE_BRANCH_NAME' │                         true                          │   'default'    │
│    4    │   'ENABLE_RULE_PR_TARGET_BRANCH'    │                         true                          │   'default'    │
│    5    │  'ENABLE_RULE_PR_TOO_MANY_COMMITS'  │                         true                          │   'default'    │
│    6    │    'ENABLE_OUTPUT_INSTRUCTIONS'     │                         true                          │   'default'    │
│    7    │             'CLA_LINK'              │                          ''                           │   'default'    │
│    8    │   'COMMIT_MESSAGE_ALLOWED_TYPES'    │ 'change,ci,docs,feat,fix,refactor,remove,revert,test' │   'default'    │
│    9    │      'CONTRIBUTING_GUIDE_FILE'      │                          ''                           │   'default'    │
│   10    │   'IGNORED_SECTIONS_DESCRIPTION'    │              'related,release,breaking'               │   'default'    │
│   11    │         'IS_GITLAB_MIRROR'          │                         false                         │   'default'    │
│   12    │   'MAX_COMMIT_MESSAGE_BODY_LINE'    │                          100                          │   'default'    │
│   13    │    'MAX_COMMIT_MESSAGE_SUMMARY'     │                          72                           │   'default'    │
│   14    │         'MAX_COMMITS_WARN'          │                           5                           │   'default'    │
│   15    │            'MAX_COMMITS'            │                           2                           │   'default'    │
│   16    │           'MAX_PR_LINES'            │                         1000                          │   'default'    │
│   17    │    'MIN_COMMIT_MESSAGE_SUMMARY'     │                          20                           │   'default'    │
│   18    │     'MIN_PR_DESCRIPTION_LENGTH'     │                          50                           │   'default'    │
└─────────┴─────────────────────────────────────┴───────────────────────────────────────────────────────┴────────────────┘
Error:  RequestError [HttpError]: API rate limit exceeded for 68.154.54.34. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)
    at /node_modules/@octokit/request/dist-node/index.js:86:21
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  status: 403,
  response: {
    url: 'https://api.github.com/repos/espressif/esp-iot-solution',
    status: 403,
    headers: {
      'access-control-allow-origin': '*',
      'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-RateLimit-Used, X-RateLimit-Resource, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, Deprecation, Sunset',
      connection: 'close',
      'content-length': '278',
      'content-security-policy': "default-src 'none'; style-src 'unsafe-inline'",
      'content-type': 'application/json; charset=utf-8',
      date: 'Fri, 18 Jul 2025 04:16:38 GMT',
      'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
      server: 'Varnish',
      'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
      'x-content-type-options': 'nosniff',
      'x-frame-options': 'deny',
      'x-github-media-type': 'github.v3; format=json',
      'x-github-request-id': '93C1:D3018:B1A29A:166C154:6879CAA6',
      'x-ratelimit-limit': '60',
      'x-ratelimit-remaining': '0',
      'x-ratelimit-reset': '1752812697',
      'x-ratelimit-resource': 'core',
      'x-ratelimit-used': '60',
      'x-xss-protection': '1; mode=block'
    },
    data: {
      message: "API rate limit exceeded for 68.154.54.34. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)",
      documentation_url: 'https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting'
    }
  },
  request: {
    method: 'GET',
    url: 'https://api.github.com/repos/espressif/esp-iot-solution',
    headers: {
      accept: 'application/vnd.github.v3+json',
      'user-agent': 'octokit-rest.js/18.12.0 octokit-core.js/3.6.0 Node.js/18.15.0 (linux; x64)'
    },
    request: { hook: [Function: bound bound register] }
  }
}
danger-results://tmp/danger-results-db4b1716.json

Generated by 🚫 dangerJS against 5276b26

[leeebo]

Hi @MarcioBulla, the fix looks good to me. Thanks for your contribution!

[leeebo]

sha=5276b266784ad28c9e6108572a388439fdc7e7ca