[4.3] Remove unused local variables

Author: fancyweb

Response/ResponseTrait.php

@@ -104,7 +104,6 @@ public function getContent(bool $throw = true): string
 
         if (null === $this->content) {
             $content = null;
-            $chunk = null;
 
             foreach (self::stream([$this]) as $chunk) {
                 if (!$chunk->isLast()) {