small fix for RoleSecurityIdentity

Author: Wim Vandersmissen

src/Symfony/Component/Security/Acl/Domain/RoleSecurityIdentity.php

@@ -12,7 +12,7 @@
 namespace Symfony\Component\Security\Acl\Domain;
 
 use Symfony\Component\Security\Acl\Model\SecurityIdentityInterface;
-use Symfony\Component\Security\Core\Role\Role;
+use Symfony\Component\Security\Core\Role\RoleInterface;
 
 /**
  * A SecurityIdentity implementation for roles
@@ -26,11 +26,11 @@ final class RoleSecurityIdentity implements SecurityIdentityInterface
     /**
      * Constructor
      *
-     * @param mixed $role a Role instance, or its string representation
+     * @param mixed $role an object implementing RoleInterface, or its string representation
      */
     public function __construct($role)
     {
-        if ($role instanceof Role) {
+        if ($role instanceof RoleInterface) {
             $role = $role->getRole();
         }