[media] : cxd2830r: 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: Antti Palosaari <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb-frontends/cxd2820r_core.c

···
 static int cxd2820r_gpio_direction_output(struct gpio_chip *chip, unsigned nr,
 		int val)
 {
-	struct cxd2820r_priv *priv =
-			container_of(chip, struct cxd2820r_priv, gpio_chip);
+	struct cxd2820r_priv *priv = gpiochip_get_data(chip);
 	u8 gpio[GPIO_COUNT];
 
 	dev_dbg(&priv->i2c->dev, "%s: nr=%d val=%d\n", __func__, nr, val);
···
 
 static void cxd2820r_gpio_set(struct gpio_chip *chip, unsigned nr, int val)
 {
-	struct cxd2820r_priv *priv =
-			container_of(chip, struct cxd2820r_priv, gpio_chip);
+	struct cxd2820r_priv *priv = gpiochip_get_data(chip);
 	u8 gpio[GPIO_COUNT];
 
 	dev_dbg(&priv->i2c->dev, "%s: nr=%d val=%d\n", __func__, nr, val);
···
 
 static int cxd2820r_gpio_get(struct gpio_chip *chip, unsigned nr)
 {
-	struct cxd2820r_priv *priv =
-			container_of(chip, struct cxd2820r_priv, gpio_chip);
+	struct cxd2820r_priv *priv = gpiochip_get_data(chip);
 
 	dev_dbg(&priv->i2c->dev, "%s: nr=%d\n", __func__, nr);
 
···
 		priv->gpio_chip.base = -1; /* dynamic allocation */
 		priv->gpio_chip.ngpio = GPIO_COUNT;
 		priv->gpio_chip.can_sleep = 1;
-		ret = gpiochip_add(&priv->gpio_chip);
+		ret = gpiochip_add_data(&priv->gpio_chip, priv);
 		if (ret)
 			goto error;