ALSA: fireface: obsolete usage of ktime_set() for zero assignment

In development period for Linux v4.10, ktime_t became an alias of s64,
instead of union. I forgot it. We can just assign zero, instead of usage
of ktime_set(0, 0).

Fixes: 19174295 ("ALSA: fireface: add transaction support")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/fireface/ff-transaction.c

@@ -21,7 +21,7 @@ static void finish_transmit_midi_msg(struct snd_ff *ff, unsigned int port,
 
 	if (rcode != RCODE_COMPLETE) {
 		/* Transfer the message again, immediately. */
-		ff->next_ktime[port] = ktime_set(0, 0);
+		ff->next_ktime[port] = 0;
 		schedule_work(&ff->rx_midi_work[port]);
 		return;
 	}