drm/mcde: 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 the mcde drm 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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230507162616.1368908-28-u.kleine-koenig@pengutronix.de

drivers/gpu/drm/mcde/mcde_drv.c

@@ -448,7 +448,7 @@ static int mcde_probe(struct platform_device *pdev)
 
 }
 
-static int mcde_remove(struct platform_device *pdev)
+static void mcde_remove(struct platform_device *pdev)
 {
 	struct drm_device *drm = platform_get_drvdata(pdev);
 	struct mcde *mcde = to_mcde(drm);
@@ -457,8 +457,6 @@ static int mcde_remove(struct platform_device *pdev)
 	clk_disable_unprepare(mcde->mcde_clk);
 	regulator_disable(mcde->vana);
 	regulator_disable(mcde->epod);
-
-	return 0;
 }
 
 static const struct of_device_id mcde_of_match[] = {
@@ -474,7 +472,7 @@ static struct platform_driver mcde_driver = {
 		.of_match_table = of_match_ptr(mcde_of_match),
 	},
 	.probe = mcde_probe,
-	.remove = mcde_remove,
+	.remove_new = mcde_remove,
 };
 
 static struct platform_driver *const component_drivers[] = {

drivers/gpu/drm/mcde/mcde_dsi.c

@@ -1208,14 +1208,12 @@ static int mcde_dsi_probe(struct platform_device *pdev)
 	return component_add(dev, &mcde_dsi_component_ops);
 }
 
-static int mcde_dsi_remove(struct platform_device *pdev)
+static void mcde_dsi_remove(struct platform_device *pdev)
 {
 	struct mcde_dsi *d = platform_get_drvdata(pdev);
 
 	component_del(&pdev->dev, &mcde_dsi_component_ops);
 	mipi_dsi_host_unregister(&d->dsi_host);
-
-	return 0;
 }
 
 static const struct of_device_id mcde_dsi_of_match[] = {
@@ -1231,5 +1229,5 @@ struct platform_driver mcde_dsi_driver = {
 		.of_match_table = of_match_ptr(mcde_dsi_of_match),
 	},
 	.probe = mcde_dsi_probe,
-	.remove = mcde_dsi_remove,
+	.remove_new = mcde_dsi_remove,
 };