ARM: at91/pm: remove unused void (*at91_pm_standby)(void)

Because the standby mode use the same sram function as the suspend to memory
mode, void (*at91_pm_standby)(void) doesn't need, remove it.
Signed-off-by: NWenyou Yang <wenyou.yang@atmel.com>
Tested-by: NSylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/pm.c

@@ -42,7 +42,6 @@ static struct {
 	int memctrl;
 } at91_pm_data;
 
-static void (*at91_pm_standby)(void);
 void __iomem *at91_ramc_base[2];
 
 static int at91_pm_valid_state(suspend_state_t state)
@@ -207,10 +206,8 @@ static struct platform_device at91_cpuidle_device = {
 
 static void at91_pm_set_standby(void (*at91_standby)(void))
 {
-	if (at91_standby) {
+	if (at91_standby)
 		at91_cpuidle_device.dev.platform_data = at91_standby;
-		at91_pm_standby = at91_standby;
-	}
 }
 
 static const struct of_device_id ramc_ids[] __initconst = {