m68k: coldfire: gpio: use new line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>

Author: Bartosz Golaszewski

arch/m68k/coldfire/gpio.c

@@ -123,10 +123,12 @@ static int mcfgpio_direction_output(struct gpio_chip *chip, unsigned offset,
 	return __mcfgpio_direction_output(offset, value);
 }
 
-static void mcfgpio_set_value(struct gpio_chip *chip, unsigned offset,
-			      int value)
+static int mcfgpio_set_value(struct gpio_chip *chip, unsigned int offset,
+			     int value)
 {
 	__mcfgpio_set_value(offset, value);
+
+	return 0;
 }
 
 static int mcfgpio_request(struct gpio_chip *chip, unsigned offset)
@@ -158,7 +160,7 @@ static struct gpio_chip mcfgpio_chip = {
 	.direction_input	= mcfgpio_direction_input,
 	.direction_output	= mcfgpio_direction_output,
 	.get			= mcfgpio_get_value,
-	.set			= mcfgpio_set_value,
+	.set_rv			= mcfgpio_set_value,
 	.to_irq			= mcfgpio_to_irq,
 	.base			= 0,
 	.ngpio			= MCFGPIO_PIN_MAX,