User is_super_admin(). Props GIGALinux. see #11644

git-svn-id: https://develop.svn.wordpress.org/trunk@12646 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/ms-edit.php

@@ -4,9 +4,8 @@ require_once('admin.php');
 if ( !is_multisite() )
 	wp_die( __('Multisite support is not enabled.') );
 
-if( is_site_admin() == false ) {
+if ( !is_super_admin() )
 	wp_die( __('You do not have permission to access this page.') );
-}
 
 do_action('wpmuadminedit', '');