remove unnecessary retrieval and setting of data

Author: Trent Steel

Extension/Csrf/EventListener/CsrfValidationListener.php

@@ -84,9 +84,10 @@ public function __construct($fieldName, CsrfProviderInterface $csrfProvider, $in
     public function preSubmit(FormEvent $event)
     {
         $form = $event->getForm();
-        $data = $event->getData();
 
         if ($form->isRoot() && $form->getConfig()->getOption('compound')) {
+            $data = $event->getData();
+
             if (!isset($data[$this->fieldName]) || !$this->csrfProvider->isCsrfTokenValid($this->intention, $data[$this->fieldName])) {
                 $errorMessage = $this->errorMessage;
 
@@ -99,10 +100,9 @@ public function preSubmit(FormEvent $event)
 
             if (is_array($data)) {
                 unset($data[$this->fieldName]);
+                $event->setData($data);
             }
         }
-
-        $event->setData($data);
     }
 
     /**