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 <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/core/Kconfig

···
 config SND_PCM
 	tristate
 	select SND_TIMER
+	select GCD
 
 config SND_HWDEP
 	tristate

sound/core/pcm_timer.c

···
  */
 
 #include <linux/time.h>
+#include <linux/gcd.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/timer.h>
···
 /*
  *  Timer functions
  */
-
-/* Greatest common divisor */
-static unsigned long gcd(unsigned long a, unsigned long b)
-{
-	unsigned long r;
-	if (a < b) {
-		r = a;
-		a = b;
-		b = r;
-	}
-	while ((r = a % b) != 0) {
-		a = b;
-		b = r;
-	}
-	return b;
-}
 
 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
 {