ALSA: 6fire: Drop the dead code

A few error handling code was forgotten where it never reaches.
Drop it.

Link: https://lore.kernel.org/r/20191105151856.10785-8-tiwai@suse.deSigned-off-by: NTakashi Iwai <tiwai@suse.de>

sound/usb/6fire/pcm.c

@@ -660,13 +660,6 @@ int usb6fire_pcm_init(struct sfire_chip *chip)
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_ops);
 
-	if (ret) {
-		usb6fire_pcm_buffers_destroy(rt);
-		kfree(rt);
-		dev_err(&chip->dev->dev,
-			"error preallocating pcm buffers.\n");
-		return ret;
-	}
 	rt->instance = pcm;
 
 	chip->pcm = rt;