Change order of check in global hook

First, check if the requested controller is public.
If it is, we do not care if the user is logged in, so don't
even make the "logged in"-checks at this moment.

application/hooks/global.php

@@ -34,7 +34,7 @@ function check_login() {
 	$public_controllers = array('auth', 'xmlrpc');
 
 	$CI = & get_instance();
-	if (!$CI->input->is_ajax_request() && !$CI->access->isLoggedIn() && !in_array($CI->router->class, $public_controllers)) {
+	if (!in_array($CI->router->class, $public_controllers) && !$CI->input->is_ajax_request() && !$CI->access->isLoggedIn()) {
 		redirect('auth/login');
 	}
 }