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/opti9xx/miro.c b/sound/isa/opti9xx/miro.c
index 4641daa..440755c 100644
--- a/sound/isa/opti9xx/miro.c
+++ b/sound/isa/opti9xx/miro.c
@@ -675,7 +675,8 @@
 	unsigned int idx;
 	int err;
 
-	snd_assert(miro != NULL && miro->card != NULL, return -EINVAL);
+	if (snd_BUG_ON(!miro || !miro->card))
+		return -EINVAL;
 
 	card = miro->card;