pl061: fix offset value range checking

The valid offset value is 0..PL061_GPIO_NR-1, this patch corrects the
offset value range checking.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/gpio/pl061.c

@@ -164,7 +164,7 @@ static int pl061_irq_type(unsigned irq, unsigned trigger)
 	unsigned long flags;
 	u8 gpiois, gpioibe, gpioiev;
 
-	if (offset < 0 || offset > PL061_GPIO_NR)
+	if (offset < 0 || offset >= PL061_GPIO_NR)
 		return -EINVAL;
 
 	spin_lock_irqsave(&chip->irq_lock, flags);