Fix inconsistent return points.

Author: derrabus

File/MimeType/ExtensionGuesser.php

@@ -90,5 +90,7 @@ public function guess($mimeType)
                 return $extension;
             }
         }
+
+        return null;
     }
 }

File/MimeType/MimeTypeGuesser.php

@@ -129,5 +129,7 @@ public function guess($path)
         if (2 === \count($this->guessers) && !FileBinaryMimeTypeGuesser::isSupported() && !FileinfoMimeTypeGuesser::isSupported()) {
             throw new \LogicException('Unable to guess the mime type as no guessers are available (Did you enable the php_fileinfo extension?)');
         }
+
+        return null;
     }
 }

Request.php

@@ -97,49 +97,49 @@ class Request
     /**
      * Custom parameters.
      *
-     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     * @var ParameterBag
      */
     public $attributes;
 
     /**
      * Request body parameters ($_POST).
      *
-     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     * @var ParameterBag
      */
     public $request;
 
     /**
      * Query string parameters ($_GET).
      *
-     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     * @var ParameterBag
      */
     public $query;
 
     /**
      * Server and execution environment parameters ($_SERVER).
      *
-     * @var \Symfony\Component\HttpFoundation\ServerBag
+     * @var ServerBag
      */
     public $server;
 
     /**
      * Uploaded files ($_FILES).
      *
-     * @var \Symfony\Component\HttpFoundation\FileBag
+     * @var FileBag
      */
     public $files;
 
     /**
      * Cookies ($_COOKIE).
      *
-     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     * @var ParameterBag
      */
     public $cookies;
 
     /**
      * Headers (taken from the $_SERVER).
      *
-     * @var \Symfony\Component\HttpFoundation\HeaderBag
+     * @var HeaderBag
      */
     public $headers;
 
@@ -199,7 +199,7 @@ class Request
     protected $format;
 
     /**
-     * @var \Symfony\Component\HttpFoundation\Session\SessionInterface
+     * @var SessionInterface
      */
     protected $session;
 
@@ -1449,6 +1449,8 @@ public function getFormat($mimeType)
                 return $format;
             }
         }
+
+        return null;
     }
 
     /**

Response.php

@@ -88,7 +88,7 @@ class Response
     const HTTP_NETWORK_AUTHENTICATION_REQUIRED = 511;                             // RFC6585
 
     /**
-     * @var \Symfony\Component\HttpFoundation\ResponseHeaderBag
+     * @var ResponseHeaderBag
      */
     public $headers;
 
@@ -790,6 +790,8 @@ public function getMaxAge()
         if (null !== $this->getExpires()) {
             return (int) $this->getExpires()->format('U') - (int) $this->getDate()->format('U');
         }
+
+        return null;
     }
 
     /**
@@ -846,6 +848,8 @@ public function getTtl()
         if (null !== $maxAge = $this->getMaxAge()) {
             return $maxAge - $this->getAge();
         }
+
+        return null;
     }
 
     /**