minor #34430 [HttpKernel] Make ErrorListener::onKernelException()'s d…

…ispatcher argument explicit (chalasr)

This PR was merged into the 4.4 branch.

Discussion
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[HttpKernel] Make ErrorListener::onKernelException()'s dispatcher argument explicit

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

One less BC break for 5.0

Commits
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aab9b43 [HttpKernel] Make ErrorListener::onKernelException()'s dispatcher argument explicit

src/Symfony/Component/HttpKernel/EventListener/ErrorListener.php

@@ -46,15 +46,14 @@ public function logKernelException(ExceptionEvent $event)
         $this->logException($event->getThrowable(), sprintf('Uncaught PHP Exception %s: "%s" at %s line %s', $e->getClass(), $e->getMessage(), $e->getFile(), $e->getLine()));
     }
 
-    public function onKernelException(ExceptionEvent $event)
+    public function onKernelException(ExceptionEvent $event, string $eventName = null, EventDispatcherInterface $eventDispatcher = null)
     {
         if (null === $this->controller) {
             return;
         }
 
         $exception = $event->getThrowable();
         $request = $this->duplicateRequest($exception, $event->getRequest());
-        $eventDispatcher = \func_num_args() > 2 ? func_get_arg(2) : null;
 
         try {
             $response = $event->getKernel()->handle($request, HttpKernelInterface::SUB_REQUEST, false);