gpio: em: use gpiochip data pointer

This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Cc: Geert Uytterhoeven <[e-mail]>
Cc: Magnus Damm <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-em.c

···
 
 static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip)
 {
-	return container_of(chip, struct em_gio_priv, gpio_chip);
+	return gpiochip_get_data(chip);
 }
 
 static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
···
 		goto err1;
 	}
 
-	ret = gpiochip_add(gpio_chip);
+	ret = gpiochip_add_data(gpio_chip, p);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add GPIO controller\n");
 		goto err1;