[ALSA] Fix compile warning in timer.c

Fix a compile warning in timer.c due to unused variables.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/timer.c b/sound/core/timer.c
index e37eab7..d92f73c 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1061,7 +1061,6 @@
 static void snd_timer_proc_read(struct snd_info_entry *entry,
 				struct snd_info_buffer *buffer)
 {
-	unsigned long flags;
 	struct snd_timer *timer;
 	struct snd_timer_instance *ti;
 	struct list_head *p, *q;