ASoC: au1x: ac97c: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20230315150745.67084-35-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/au1x/ac97c.c

@@ -285,7 +285,7 @@ static int au1xac97c_drvprobe(struct platform_device *pdev)
 	return 0;
 }
 
-static int au1xac97c_drvremove(struct platform_device *pdev)
+static void au1xac97c_drvremove(struct platform_device *pdev)
 {
 	struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);
 
@@ -294,8 +294,6 @@ static int au1xac97c_drvremove(struct platform_device *pdev)
 	WR(ctx, AC97_ENABLE, EN_D);	/* clock off, disable */
 
 	ac97c_workdata = NULL;	/* MDEV */
-
-	return 0;
 }
 
 #ifdef CONFIG_PM
@@ -338,7 +336,7 @@ static struct platform_driver au1xac97c_driver = {
 		.pm	= AU1XPSCAC97_PMOPS,
 	},
 	.probe		= au1xac97c_drvprobe,
-	.remove		= au1xac97c_drvremove,
+	.remove_new	= au1xac97c_drvremove,
 };
 
 module_platform_driver(au1xac97c_driver);