ALSA: firewire-tascam: change type of valiables according to function prototype

In the callback function of asynchronous MIDI port, some local variables
are declared 'unsigned int', while they're assigned to int value of return
from snd_rawmidi_transmit_peek().

This commit fixes the type.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/tascam/tascam-transaction.c

@@ -62,10 +62,8 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
 {
 	struct snd_tscm *tscm = substream->rmidi->private_data;
 	unsigned int port = substream->number;
-	unsigned int len;
-	unsigned int i;
+	int i, len, consume;
 	u8 status;
-	int consume;
 
 	len = snd_rawmidi_transmit_peek(substream, buf + 1, 3);
 	if (len == 0)