service_stop(): Nothing to do if svc is already stopping or halted

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/service.c

@@ -417,6 +417,9 @@ static int service_stop(svc_t *svc)
 	if (!svc)
 		return 1;
 
+	if (svc->state <= SVC_STOPPING_STATE)
+		return 0;
+
 #ifdef INETD_ENABLED
 	if (svc_is_inetd(svc)) {
 		int do_progress = runlevel != 1 && !svc_is_busy(svc);