ALSA: sound/core/pcm_timer.c: use lib/gcd.c

Make sound/core/pcm_timer.c use lib/gcd.c

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/Kconfig b/sound/core/Kconfig
index c15682a..475455c 100644
--- a/sound/core/Kconfig
+++ b/sound/core/Kconfig
@@ -5,6 +5,7 @@
 config SND_PCM
 	tristate
 	select SND_TIMER
+	select GCD
 
 config SND_HWDEP
 	tristate