ALSA: hdsp - Fix potential Oops in snd_hdsp_info_pref_sync_ref()

Dan Carpenter reported that setting 0 to uinfo->value.enumerated.items
in snd_hdsp_info_pref_sync_ref() may lead to Oops.  This function should
return an error immediately in such a case instead.

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme9652/hdsp.c

@@ -2640,8 +2640,7 @@ static int snd_hdsp_info_pref_sync_ref(struct snd_kcontrol *kcontrol, struct snd
 		uinfo->value.enumerated.items = 3;
 		break;
 	default:
-		uinfo->value.enumerated.items = 0;
-		break;
+		return -EINVAL;
 	}
 
 	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)