Line 521 pass by ref fatal error

Hello. I don't have time to create a patch for this; I will try and do it sometime this week. It's simple though.

Line 521 of admin_menu.inc causes a "fatal error" as it tries to pass in NULL as a var ref to clear the cache.

System clear cache method signature: (http://api.drupal.org/api/function/system_clear_cache_submit/6)
function($form, &$form_state);

521 passes:
function(array(), NULL); ( in essance )

changed line to:
system_clear_cache_submit($form_state, $form_state);

from:
system_clear_cache_submit($form_state, NULL);