examples: fix staticcheck issues (SA4022, SA1029) in kind_with_config

[av-petrov]

Fix two staticcheck issues found in examples/kind/kind_with_config:

• Avoid comparing address of variable to nil (SA4022)
• Use dedicated key type instead of string for context.WithValue (SA1029)

Although examples are excluded from linter checks, they are widely copied by users.
Fixing these issues prevents spreading bad patterns and keeps the examples correct.

Verified with:
staticcheck ./examples/kind/kind_with_config/...
go test ./examples/kind/kind_with_config/...

Signed-off-by: Andrey Petrov [email protected]

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: av-petrov / name: Andrey Petrov (5b2bebf)

[k8s-ci-robot]

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This pull-request has been approved by: av-petrov
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[k8s-ci-robot]

Hi @av-petrov. Thanks for your PR.

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[av-petrov]

I signed it

[av-petrov]

I signed it

[vladimirvivien]

/test all

[vladimirvivien]

/ok-to-test