if (u->buf) { kfree(u->buf); u->buf = NULL; } 
kfree(u->buf); u->buf = NULL; 
static void release_urb_ctx(snd_urb_ctx_t *u){	if (u->urb) {		usb_free_urb(u->urb);		u->urb = NULL;	}	if (u->buf) {		kfree(u->buf);		u->buf = NULL;	}}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/4d572776d4dfa2d5385a2ec3acec3cc059149e13/usbaudio.c/clean/sound/usb/usbaudio.c