snd_seq_deliver_single_event
result = snd_seq_deliver_single_event(NULL, &bounce_ev, atomic, hop + 1);
err = snd_seq_deliver_single_event(client, event, atomic, hop);
static int snd_seq_deliver_single_event(struct snd_seq_client *client,
result = snd_seq_deliver_single_event(client, event, atomic, hop);