Small code improvements

Author: Bellangelo

src/Rules/Keywords/RequireFileExistsRule.php

@@ -30,7 +30,7 @@ public function processNode(Node $node, Scope $scope): array
 		$paths = $this->resolveFilePaths($node, $scope);
 
 		foreach ($paths as $path) {
-			if (stream_resolve_include_path($path)) {
+			if (stream_resolve_include_path($path) !== false) {
 				continue;
 			}
 

tests/PHPStan/Rules/Keywords/RequireFileExistsRuleTest.php

@@ -4,6 +4,11 @@
 
 use PHPStan\Rules\Rule;
 use PHPStan\Testing\RuleTestCase;
+use function get_include_path;
+use function implode;
+use function realpath;
+use function set_include_path;
+use const PATH_SEPARATOR;
 
 /**
  * @extends RuleTestCase<RequireFileExistsRule>