Calling the right Garbage Colector callback when using Cache as Sessi…

…on Save Handler. Fixes #6229.

git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@8129 3807eeeb-6ff5-0310-8944-8be069107fe0

cake/libs/session.php

@@ -510,7 +510,7 @@ function __initSession() {
 													array('Cache', 'read'),
 													array('Cache', 'write'),
 													array('Cache', 'delete'),
-													array('CakeSession', '__gc'));
+													array('Cache', 'gc'));
 			break;
 			default:
 				if (empty($_SESSION)) {