ARM: SAMSUNG: Fix warning 's3c_pm_show_resume_irqs' defined but not used

s3c_pm_show_resume_irqs() is used by some s3c_pm_arch_show_resume_irqs()
implementations, which get included through mach/pm-core.h. Add __maybe_unused
to silence warnings when it isn't used (e.g. on S3C64XX platforms).

Signed-off-by: Maurus Cuelenaere <mcuelenaere@gmail.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/plat-samsung/pm.c b/arch/arm/plat-samsung/pm.c
index d5b58d3..5c0a440 100644
--- a/arch/arm/plat-samsung/pm.c
+++ b/arch/arm/plat-samsung/pm.c
@@ -214,8 +214,9 @@
  *
  * print any IRQs asserted at resume time (ie, we woke from)
 */
-static void s3c_pm_show_resume_irqs(int start, unsigned long which,
-				    unsigned long mask)
+static void __maybe_unused s3c_pm_show_resume_irqs(int start,
+						   unsigned long which,
+						   unsigned long mask)
 {
 	int i;