ALSA: Kill snd_assert() in sound/isa/*

Kill snd_assert() in sound/isa/*, 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/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index 0bb9b92..4c41082 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -1648,9 +1648,10 @@
 
 	card = (struct snd_card *) hw->card;
 
-	snd_assert(card != NULL, return -ENODEV);
-
-	snd_assert(card->private_data != NULL, return -ENODEV);
+	if (snd_BUG_ON(!card))
+		return -ENODEV;
+	if (snd_BUG_ON(!card->private_data))
+		return -ENODEV;
 
 	acard = card->private_data;
 	dev = &acard->wavefront;