ARM: S3C24XX: fix uninitialized variable warning

the use of variable tmp is uninitialized, so we fix it.

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-s3c24xx/common.c b/arch/arm/mach-s3c24xx/common.c
index 0c9e9a7..6bcf87f 100644
--- a/arch/arm/mach-s3c24xx/common.c
+++ b/arch/arm/mach-s3c24xx/common.c
@@ -197,7 +197,7 @@
 
 static void s3c24xx_default_idle(void)
 {
-	unsigned long tmp;
+	unsigned long tmp = 0;
 	int i;
 
 	/* idle the system by using the idle mode which will wait for an