[FrameworkBundle] minor fix

A small fix in the "parse" function of the "ControllerNameParser" Controller.
We should use "!==" instead of "!=" since it's better and faster in this case.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | NA
| License       | MIT
| Doc PR        | NA

Author: nayzo

src/Symfony/Bundle/FrameworkBundle/Controller/ControllerNameParser.php

@@ -46,7 +46,7 @@ public function __construct(KernelInterface $kernel)
      */
     public function parse($controller)
     {
-        if (3 != count($parts = explode(':', $controller))) {
+        if (3 !== count($parts = explode(':', $controller))) {
             throw new \InvalidArgumentException(sprintf('The "%s" controller is not a valid "a:b:c" controller string.', $controller));
         }