ALSA: firewire: Convert to snd_card_new() with a device pointer

Also remove superfluous snd_card_set_dev() calls.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/firewire/speakers.c b/sound/firewire/speakers.c
index cc8bc3a..9f7ef21 100644
--- a/sound/firewire/speakers.c
+++ b/sound/firewire/speakers.c
@@ -668,10 +668,10 @@
 	u32 firmware;
 	int err;
 
-	err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*fwspk), &card);
+	err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
+			   sizeof(*fwspk), &card);
 	if (err < 0)
 		return err;
-	snd_card_set_dev(card, &unit->device);
 
 	fwspk = card->private_data;
 	fwspk->card = card;