ASoC: codecs: max9768: use snd_kcontrol_chip() instead of snd_soc_kcontrol_component()

We have very similar name functions (A)(B). Both gets component from
snd_kcontrol, but (A) is used in callback functions which is registered
through snd_soc_add_component_controls(), (B) is used through
snd_soc_dapm_new_widgets().

(A) snd_soc_kcontrol_component()
(B) snd_soc_dapm_kcontrol_component()

(B) is using very picky way to get component but using it is necessary in
ASoC. But (A) is just wrapper function to snd_kcontrol_chip(), and directly
using it without wrapper is very common way on ALSA.
To reduce confusions of similar function, let's use common way on (A).

Signed-off-by: Kuninori Morimoto <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/max9768.c

···
 static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol)
 {
-	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
+	struct snd_soc_component *c = snd_kcontrol_chip(kcontrol);
 	struct max9768 *max9768 = snd_soc_component_get_drvdata(c);
 	int val = gpiod_get_value_cansleep(max9768->mute);
 
···
 static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol)
 {
-	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
+	struct snd_soc_component *c = snd_kcontrol_chip(kcontrol);
 	struct max9768 *max9768 = snd_soc_component_get_drvdata(c);
 	bool val = !ucontrol->value.integer.value[0];
 	int ret;