[TASK] Fix phpstan checkFunctionArgumentTypes errors in ext:core Type

This patch fixes incompatible type usage in function arguments
and is preparatory work for introducing native type hints and
strict mode in all core files.

Releases: master, 10.4
Resolves: #92254
Change-Id: I3c5d0625a497acd10696b8ce6ea58a9fa891bc18
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65714
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>

typo3/sysext/core/Classes/Type/File/ImageInfo.php

@@ -120,6 +120,9 @@ protected function extractSvgImageSizes()
         $imagesSizes = [];
 
         $fileContent = file_get_contents($this->getPathname());
+        if ($fileContent === false) {
+            return false;
+        }
         // Disables the functionality to allow external entities to be loaded when parsing the XML, must be kept
         $previousValueOfEntityLoader = libxml_disable_entity_loader(true);
         $xml = simplexml_load_string($fileContent, \SimpleXMLElement::class, LIBXML_NOERROR | LIBXML_NOWARNING);