drm/bridge: cdns-mhdp8546: 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>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231102165640.3307820-23-u.kleine-koenig@pengutronix.de

drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c

@@ -2596,7 +2596,7 @@ static int cdns_mhdp_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int cdns_mhdp_remove(struct platform_device *pdev)
+static void cdns_mhdp_remove(struct platform_device *pdev)
 {
 	struct cdns_mhdp_device *mhdp = platform_get_drvdata(pdev);
 	unsigned long timeout = msecs_to_jiffies(100);
@@ -2634,8 +2634,6 @@ static int cdns_mhdp_remove(struct platform_device *pdev)
 	/* Ignoring mhdp->hdcp.check_work and mhdp->hdcp.prop_work here. */
 
 	clk_disable_unprepare(mhdp->clk);
-
-	return 0;
 }
 
 static const struct of_device_id mhdp_ids[] = {
@@ -2658,7 +2656,7 @@ static struct platform_driver mhdp_driver = {
 		.of_match_table	= mhdp_ids,
 	},
 	.probe	= cdns_mhdp_probe,
-	.remove	= cdns_mhdp_remove,
+	.remove_new = cdns_mhdp_remove,
 };
 module_platform_driver(mhdp_driver);