ALSA: ac97: make remove callback of ac97 driver void returned

Since commit fc7a6209 ("bus: Make remove callback return void")
forces bus_type::remove be void-returned, it doesn't make much sense
for any bus based driver implementing remove callbalk to return
non-void to its caller.

As such, change the remove function for ac97 based drivers to return
void.
Signed-off-by: Dawei Li <set_pte_at@outlook.com>
Link: https://lore.kernel.org/r/TYCP286MB2323A5AB1B2578EF4FA15DA7CAFB9@TYCP286MB2323.JPNP286.PROD.OUTLOOK.COMSigned-off-by: Takashi Iwai <tiwai@suse.de>

drivers/mfd/wm97xx-core.c

@@ -319,13 +319,11 @@ static int wm97xx_ac97_probe(struct ac97_codec_device *adev)
 	return ret;
 }
 
-static int wm97xx_ac97_remove(struct ac97_codec_device *adev)
+static void wm97xx_ac97_remove(struct ac97_codec_device *adev)
 {
 	struct wm97xx_priv *wm97xx = ac97_get_drvdata(adev);
 
 	snd_ac97_compat_release(wm97xx->ac97);
-
-	return 0;
 }
 
 static const struct ac97_id wm97xx_ac97_ids[] = {

include/sound/ac97/codec.h

@@ -63,7 +63,7 @@ struct ac97_codec_device {
 struct ac97_codec_driver {
 	struct device_driver	driver;
 	int			(*probe)(struct ac97_codec_device *);
-	int			(*remove)(struct ac97_codec_device *);
+	void			(*remove)(struct ac97_codec_device *dev);
 	void			(*shutdown)(struct ac97_codec_device *);
 	const struct ac97_id	*id_table;
 };

sound/ac97/bus.c

@@ -524,10 +524,9 @@ static void ac97_bus_remove(struct device *dev)
 	if (ret < 0)
 		return;
 
-	ret = adrv->remove(adev);
+	adrv->remove(adev);
 	pm_runtime_put_noidle(dev);
-	if (ret == 0)
-		ac97_put_disable_clk(adev);
+	ac97_put_disable_clk(adev);
 
 	pm_runtime_disable(dev);
 }