Fixed syntax error.

Author: Till Brehm

server/mods-available/rescue_core_module.inc.php

@@ -382,7 +382,7 @@ private function _rescueMySql(){
 	 * @param type $daemon the name of the daemon
 	 */
 	private function _rescueDaemon($daemon){
-		global $conf;
+		global $conf, $app;
 
 		$app->uses('system');
 		// if you need to find all restarts search for "['init_scripts']"