fix error in TestHelper require

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@19818 44c647ce-9c0f-0410-b52a-842ac1e357ba

tests/Zend/Feed/Pubsubhubbub/Subscriber/CallbackTest.php

@@ -19,7 +19,7 @@
  * @version    $Id$
  */
 
-require_once dirname(dirname(dirname(dirname(__FILE__)))) . DIRECTORY_SEPARATOR . 'TestHelper.php';
+require_once dirname(dirname(dirname(dirname(dirname(__FILE__))))) . DIRECTORY_SEPARATOR . 'TestHelper.php';
 
 require_once 'Zend/Feed/Pubsubhubbub/Subscriber/Callback.php';
 require_once 'Zend/Feed/Pubsubhubbub/Model/Subscription.php';