[ALSA] ali5451 - Fix possible NULL dereference

Reported by Eric Sesterhenn.
Fix the wrong checks of extra voice pointer, which may cause NULL
dereferences.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2007-05-19 16:30:35 +02:00 committed by Jaroslav Kysela
commit 2704364248