ALSA: Kill snd_assert() in other places

Kill snd_assert() in other places, either removed or replaced with
if () with snd_BUG_ON().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 5f98bee..6621fad 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -1389,7 +1389,8 @@
 	struct usb_mixer_elem_info *cval = kcontrol->private_data;
 	char **itemlist = (char **)kcontrol->private_value;
 
-	snd_assert(itemlist, return -EINVAL);
+	if (snd_BUG_ON(!itemlist))
+		return -EINVAL;
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
 	uinfo->count = 1;
 	uinfo->value.enumerated.items = cval->max;