codec->ac97 = NULL; 
codec->ac97[ac97->num] = NULL; 
static void snd_ali_mixer_free_ac97(ac97_t *ac97){	ali_t *codec = ac97->private_data;	codec->ac97 = NULL;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/5cbff89cbc1087870c32ecb0b7f1965f93ec5401/ali5451.c/clean/sound/pci/ali5451/ali5451.c