gpio: viperboard: Be sure to clamp return value

As we want gpio_chip .get() calls to be able to return negative
error codes and propagate to drivers, we need to go over all
drivers and make sure their return values are clamped to [0,1].
We do this by using the ret = !!(val) design pattern.

Cc: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-viperboard.c

@@ -95,7 +95,7 @@ static int vprbrd_gpioa_get(struct gpio_chip *chip,
 
 	/* if io is set to output, just return the saved value */
 	if (gpio->gpioa_out & (1 << offset))
-		return gpio->gpioa_val & (1 << offset);
+		return !!(gpio->gpioa_val & (1 << offset));
 
 	mutex_lock(&vb->lock);