gpio: pch: use new GPIO 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.

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

drivers/gpio/gpio-pch.c

···
 	spinlock_t spinlock;
 };
 
-static void pch_gpio_set(struct gpio_chip *gpio, unsigned int nr, int val)
+static int pch_gpio_set(struct gpio_chip *gpio, unsigned int nr, int val)
 {
 	u32 reg_val;
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
···
 
 	iowrite32(reg_val, &chip->reg->po);
 	spin_unlock_irqrestore(&chip->spinlock, flags);
+
+	return 0;
 }
 
 static int pch_gpio_get(struct gpio_chip *gpio, unsigned int nr)
···
 	gpio->direction_input = pch_gpio_direction_input;
 	gpio->get = pch_gpio_get;
 	gpio->direction_output = pch_gpio_direction_output;
-	gpio->set = pch_gpio_set;
+	gpio->set_rv = pch_gpio_set;
 	gpio->base = -1;
 	gpio->ngpio = gpio_pins[chip->ioh];
 	gpio->can_sleep = false;