omap: Remove uninitialized warning for gpio.c

Flags is not used on 15xx.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index f8dfa8d..d17620c 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -1117,7 +1117,7 @@
  */
 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
 {
-	unsigned long flags;
+	unsigned long uninitialized_var(flags);
 
 	switch (bank->method) {
 #ifdef CONFIG_ARCH_OMAP16XX