minor #12130 [FrameworkBundle] minor fix (NAYZO)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #12130).

Discussion
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[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?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | NA
| License       | MIT
| Doc PR        | NA

Commits
-------

cd966c6 [FrameworkBundle] minor fix

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

@@ -46,7 +46,7 @@ class ControllerNameParser
      */
     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));
         }