ALSA: usb-audio: Use SNDRV_DEV_CODEC for mixer objects

Instead of SNDRV_DEV_LOWLEVEL, use SNDRV_DEV_CODEC type for mixer
objects so that they are managed in a proper release order.
No functional change at this point.

Signed-off-by: Takashi Iwai <[e-mail]>

sound/usb/mixer.c

···
 
 	snd_usb_mixer_apply_create_quirk(mixer);
 
-	err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
+	err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
 	if (err < 0)
 		goto _error;