ALSA: firewire-tascam: off by one in handle_midi_tx()

My static checker complains because tscm->spec->midi_capture_ports is
either 2 or 4 but the tscm->tx_midi_substreams[] array has 4 elements so
this is possibly off by one.  I have looked at the code and I think it
should be >= instead of > as well.

Fixes: 107cc0129a68 ('ALSA: firewire-tascam: add support for incoming MIDI messages by asynchronous transaction')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/tascam/tascam-transaction.c

@@ -158,7 +158,7 @@ static void handle_midi_tx(struct fw_card *card, struct fw_request *request,
 
 		port = b[0] >> 4;
 		/* TODO: support virtual MIDI ports. */
-		if (port > tscm->spec->midi_capture_ports)
+		if (port >= tscm->spec->midi_capture_ports)
 			goto end;
 
 		/* Assume the message length. */