In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. This adds a pointer back to struct
snd_timer.
Signed-off-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>