plat-nomadik: fix compilation warning

The compiler warns that [rf]wimsc may be used uninitialized in
this function - the warning is actually false since the uses are
in identical if()-clauses, but it can't hurt very much to read
out the values to be modified early anyway and rid the warning.

Cc: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/plat-nomadik/gpio.c

@@ -134,15 +134,12 @@ static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
 				     unsigned offset, int gpio_mode,
 				     bool glitch)
 {
-	u32 rwimsc;
-	u32 fwimsc;
+	u32 rwimsc = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
+	u32 fwimsc = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
 
 	if (glitch && nmk_chip->set_ioforce) {
 		u32 bit = BIT(offset);
 
-		rwimsc = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
-		fwimsc = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
-
 		/* Prevent spurious wakeups */
 		writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
 		writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);