ARM: OMAP: Fix typo in gpio

Fix typo in gpio
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/gpio.c

@@ -1092,7 +1092,7 @@ static struct irq_chip mpuio_irq_chip = {
 	.name		= "MPUIO",
 	.ack		= mpuio_ack_irq,
 	.mask		= mpuio_mask_irq,
-	.unmask		= mpuio_unmask_irq
+	.unmask		= mpuio_unmask_irq,
 	.set_type	= gpio_irq_type,
 };