ALSA: sb: Convert timers to use timer_setup()

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.

[Re-use the existing chip->midi_substream_output instead of assigning
 a new field to struct snd_sb -- tiwai]

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/sb/emu8000_pcm.c

@@ -193,9 +193,9 @@ static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
  * timer interrupt handler
  * check the current position and update the period if necessary.
  */
-static void emu8k_pcm_timer_func(unsigned long data)
+static void emu8k_pcm_timer_func(struct timer_list *t)
 {
-	struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data;
+	struct snd_emu8k_pcm *rec = from_timer(rec, t, timer);
 	int ptr, delta;
 
 	spin_lock(&rec->timer_lock);
@@ -241,7 +241,7 @@ static int emu8k_pcm_open(struct snd_pcm_substream *subs)
 	runtime->private_data = rec;
 
 	spin_lock_init(&rec->timer_lock);
-	setup_timer(&rec->timer, emu8k_pcm_timer_func, (unsigned long)rec);
+	timer_setup(&rec->timer, emu8k_pcm_timer_func, 0);
 
 	runtime->hw = emu8k_pcm_hw;
 	runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;