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/es1688/es1688_lib.c b/sound/isa/es1688/es1688_lib.c
index 1e1e575..4fbb508 100644
--- a/sound/isa/es1688/es1688_lib.c
+++ b/sound/isa/es1688/es1688_lib.c
@@ -1009,7 +1009,8 @@
 	int err;
 	unsigned char reg, val;
 
-	snd_assert(chip != NULL && chip->card != NULL, return -EINVAL);
+	if (snd_BUG_ON(!chip || !chip->card))
+		return -EINVAL;
 
 	card = chip->card;