gpio: ml-ioh: 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: Feng Tang <feng.tang@intel.com>
Cc: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-ml-ioh.c

@@ -124,7 +124,7 @@ static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
 {
 	struct ioh_gpio *chip =	container_of(gpio, struct ioh_gpio, gpio);
 
-	return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
+	return !!(ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr));
 }
 
 static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,