[TOOLS] Fix errors pointed out by PHPStan level 4

src/Core/GSFile.php

@@ -23,7 +23,6 @@ declare(strict_types = 1);
 
 namespace App\Core;
 
-use App\Core\DB;
 use function App\Core\I18n\_m;
 use App\Util\Common;
 use App\Util\Exception\DuplicateFoundException;
@@ -109,7 +108,7 @@ class GSFile
             // The following properly gets the mimetype with `file` or other
             // available methods, so should be safe
             $mimetype               = mb_substr($file->getMimeType(), 0, 64);
-            $width                  = $height                  = null;
+            $width                  = $height = null;
             $event_map[$mimetype]   = [];
             $major_mime             = self::mimetypeMajor($mimetype);
             $event_map[$major_mime] = [];
@@ -120,6 +119,7 @@ class GSFile
             }
             // Always prefer specific encoders
             $encoders = array_merge($event_map[$mimetype], $event_map[$major_mime]);
+            // @phpstan-ignore-next-line
             foreach ($encoders as $encoder) {
                 if ($encoder($file, $mimetype, $width, $height)) {
                     break; // One successful sanitizer is enough
@@ -315,7 +315,7 @@ class GSFile
 
         $fallback = function ($title) use ($ext) {
             if (!\is_null($ext)) {
-                return ($title) . ".{$ext}";
+                return $title . ".{$ext}";
             }
         };