Minor fixes around parse_url() checks

Author: nicolas-grekas

FileLocator.php

@@ -84,7 +84,7 @@ private function isAbsolutePath(string $file): bool
                 && ':' === $file[1]
                 && ('\\' === $file[2] || '/' === $file[2])
             )
-            || null !== parse_url($file, \PHP_URL_SCHEME)
+            || parse_url($file, \PHP_URL_SCHEME)
         ) {
             return true;
         }