Revert "remove -P option"

This reverts commit fe6e4919b9bb3f9163303e5ca5cbde9d6ac47717.

src/dfuhelper.c

@@ -177,12 +177,9 @@ void irecv_device_event_cb(const irecv_device_event_t *event, void* userdata) {
 }
 
 void *dfuhelper(void* ptr) {
-	dfuhelper_thr_running = 1;
-	pthread_cleanup_push(thr_cleanup, &dfuhelper_thr_running);
 	subscribe_cmd(device_event_cb, irecv_device_event_cb);
 	while (spin) {
 		sleep(1);
 	};
-	pthread_cleanup_pop(1);
 	return 0;
 }