ALSA: timer: Fix leak in events via snd_timer_user_tinterrupt

The stack object “r1” has a total size of 32 bytes. Its field
“event” and “val” both contain 4 bytes padding. These 8 bytes
padding bytes are sent to user without being initialized.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
					    struct snd_timer_tread *tread)
{
	if (tu->qused >= tu->queue_size) {
		tu->overrun++;
	} else {
		memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
		tu->qtail %= tu->queue_size;
		tu->qused++;
	}
}

static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
					    struct snd_timer_tread *tread)
{
	if (tu->qused >= tu->queue_size) {
		tu->overrun++;
	} else {
		memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
		tu->qtail %= tu->queue_size;
		tu->qused++;
	}
}
