ASoC: ac97: 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: Liam Girdwood <[e-mail]>
Cc: [e-mail]
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

sound/soc/soc-ac97.c

···
 #ifdef CONFIG_GPIOLIB
 static inline struct snd_soc_codec *gpio_to_codec(struct gpio_chip *chip)
 {
-	struct snd_ac97_gpio_priv *gpio_priv =
-		container_of(chip, struct snd_ac97_gpio_priv, gpio_chip);
+	struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
 
 	return gpio_priv->codec;
 }
···
 static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset,
 				  int value)
 {
-	struct snd_ac97_gpio_priv *gpio_priv =
-		container_of(chip, struct snd_ac97_gpio_priv, gpio_chip);
+	struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
 	struct snd_soc_codec *codec = gpio_to_codec(chip);
 
 	gpio_priv->gpios_set &= ~(1 << offset);
···
 	gpio_priv->gpio_chip.parent = codec->dev;
 	gpio_priv->gpio_chip.base = -1;
 
-	ret = gpiochip_add(&gpio_priv->gpio_chip);
+	ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);
 	if (ret != 0)
 		dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret);
 	return ret;