gpio: mxs: Prefer unsigned int to bare use of unsigned

Fix checkpatch warnings:
    WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
Signed-off-by: Jinchao Wang <wjc@cdjrlc.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpio-mxs.c

@@ -229,14 +229,14 @@ static int mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
 	return rv;
 }
 
-static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
 {
 	struct mxs_gpio_port *port = gpiochip_get_data(gc);
 
 	return irq_find_mapping(port->domain, offset);
 }
 
-static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
+static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
 {
 	struct mxs_gpio_port *port = gpiochip_get_data(gc);
 	u32 mask = 1 << offset;