drm/sprd: 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 sprd drm drivers from always returning zero in the
remove callback to the void returning variant.

Reviewed-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Jyri Sarha <[e-mail]>
Signed-off-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Thomas Zimmermann <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/sprd/sprd_dpu.c

···
 	return component_add(&pdev->dev, &dpu_component_ops);
 }
 
-static int sprd_dpu_remove(struct platform_device *pdev)
+static void sprd_dpu_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &dpu_component_ops);
-
-	return 0;
 }
 
 struct platform_driver sprd_dpu_driver = {
 	.probe = sprd_dpu_probe,
-	.remove = sprd_dpu_remove,
+	.remove_new = sprd_dpu_remove,
 	.driver = {
 		.name = "sprd-dpu-drv",
 		.of_match_table = dpu_match_table,

drivers/gpu/drm/sprd/sprd_drm.c

···
 	return drm_of_component_probe(&pdev->dev, component_compare_of, &drm_component_ops);
 }
 
-static int sprd_drm_remove(struct platform_device *pdev)
+static void sprd_drm_remove(struct platform_device *pdev)
 {
 	component_master_del(&pdev->dev, &drm_component_ops);
-	return 0;
 }
 
 static void sprd_drm_shutdown(struct platform_device *pdev)
···
 
 static struct platform_driver sprd_drm_driver = {
 	.probe = sprd_drm_probe,
-	.remove = sprd_drm_remove,
+	.remove_new = sprd_drm_remove,
 	.shutdown = sprd_drm_shutdown,
 	.driver = {
 		.name = "sprd-drm-drv",

drivers/gpu/drm/sprd/sprd_dsi.c

···
 	return mipi_dsi_host_register(&dsi->host);
 }
 
-static int sprd_dsi_remove(struct platform_device *pdev)
+static void sprd_dsi_remove(struct platform_device *pdev)
 {
 	struct sprd_dsi *dsi = dev_get_drvdata(&pdev->dev);
 
 	mipi_dsi_host_unregister(&dsi->host);
-
-	return 0;
 }
 
 struct platform_driver sprd_dsi_driver = {
 	.probe = sprd_dsi_probe,
-	.remove = sprd_dsi_remove,
+	.remove_new = sprd_dsi_remove,
 	.driver = {
 		.name = "sprd-dsi-drv",
 		.of_match_table = dsi_match_table,