MediaHelper: proper check if file is an image (#42105) (#43345)

Author: coderiekelt

libraries/src/Helper/MediaHelper.php

@@ -277,7 +277,7 @@ public function canUpload($file, $component = 'com_media', $allowedExecutables =
                 // If tmp_name is empty, then the file was bigger than the PHP limit
                 if (!empty($file['tmp_name'])) {
                     // Get the mime type this is an image file
-                    $mime = static::getMimeType($file['tmp_name'], true);
+                    $mime = static::getMimeType($file['tmp_name'], static::isImage($file['tmp_name']));
 
                     // Did we get anything useful?
                     if ($mime != false) {