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/gus/gus_main.c b/sound/isa/gus/gus_main.c
index cccc16c..12eb98f 100644
--- a/sound/isa/gus/gus_main.c
+++ b/sound/isa/gus/gus_main.c
@@ -276,9 +276,11 @@
 	static unsigned char dmas[8] =
 		{6, 1, 0, 2, 0, 3, 4, 5};
 
-	snd_assert(gus != NULL, return -EINVAL);
+	if (snd_BUG_ON(!gus))
+		return -EINVAL;
 	card = gus->card;
-	snd_assert(card != NULL, return -EINVAL);
+	if (snd_BUG_ON(!card))
+		return -EINVAL;
 
 	gus->mix_cntrl_reg &= 0xf8;
 	gus->mix_cntrl_reg |= 0x01;	/* disable MIC, LINE IN, enable LINE OUT */