gpio: cs5535: 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.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-cs5535.c

···
 	return cs5535_gpio_isset(offset, GPIO_READ_BACK);
 }
 
-static void chip_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+static int chip_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
 {
 	if (val)
 		cs5535_gpio_set(offset, GPIO_OUTPUT_VAL);
 	else
 		cs5535_gpio_clear(offset, GPIO_OUTPUT_VAL);
+
+	return 0;
 }
 
 static int chip_direction_input(struct gpio_chip *c, unsigned offset)
···
 		.request = chip_gpio_request,
 
 		.get = chip_gpio_get,
-		.set = chip_gpio_set,
+		.set_rv = chip_gpio_set,
 
 		.direction_input = chip_direction_input,
 		.direction_output = chip_direction_output,