[SecurityBundle] Fix syntax error in test

src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Compiler/AddSessionDomainConstraintPassTest.php

@@ -124,7 +124,8 @@ class AddSessionDomainConstraintPassTest extends TestCase
         $ext = new SecurityExtension();
         $ext->load($config, $container);
 
-        (new AddSessionDomainConstraintPass())->process($container);
+        $pass = new AddSessionDomainConstraintPass();
+        $pass->process($container);
 
         return $container;
     }