Merge branch '4.4'

* 4.4:
  [4.3] Remove unused local variables

Author: nicolas-grekas

Response/ResponseTrait.php

@@ -109,7 +109,6 @@ public function getContent(bool $throw = true): string
 
         if (null === $this->content) {
             $content = null;
-            $chunk = null;
 
             foreach (self::stream([$this]) as $chunk) {
                 if (!$chunk->isLast()) {