srp_daemon: Don't create async_ev_thread if only run once

fd3005f moves the signal handler setup from ibsrpdm path. So,
default signal handler will be used when the main pthread send signal
SIGINT to pthread async_ev_thread. ibsrpdm will exit with non-zero
exit code as default signal handler killed it. ibsrpdm should return
with exit code zero, if no error emerged.

We should not create async_ev_thread for ibsrpdm.

Fixes: fd3005f ("srp_daemon: Move the setup of the wakeup_pipe after openlog")
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Honggang Li <honli@redhat.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

srp_daemon/srp_daemon.c

@@ -1945,12 +1945,12 @@ static struct resources *alloc_res(void)
 				     run_thread_get_trap_notices, &res->res);
 		if (ret)
 			goto err;
-	}
 
-	ret = pthread_create(&res->res.async_ev_thread, NULL,
-			     run_thread_listen_to_events, &res->res);
-	if (ret)
-		goto err;
+		ret = pthread_create(&res->res.async_ev_thread, NULL,
+				     run_thread_listen_to_events, &res->res);
+		if (ret)
+			goto err;
+	}
 
 	if (config->retry_timeout && !config->once) {
 		ret = pthread_create(&res->res.reconnect_thread, NULL,