backlight: aat2870_bl: 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>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230308073945.2336302-2-u.kleine-koenig@pengutronix.de

drivers/video/backlight/aat2870_bl.c

@@ -178,7 +178,7 @@ static int aat2870_bl_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int aat2870_bl_remove(struct platform_device *pdev)
+static void aat2870_bl_remove(struct platform_device *pdev)
 {
 	struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev);
 	struct backlight_device *bd = aat2870_bl->bd;
@@ -186,8 +186,6 @@ static int aat2870_bl_remove(struct platform_device *pdev)
 	bd->props.power = FB_BLANK_POWERDOWN;
 	bd->props.brightness = 0;
 	backlight_update_status(bd);
-
-	return 0;
 }
 
 static struct platform_driver aat2870_bl_driver = {
@@ -195,7 +193,7 @@ static struct platform_driver aat2870_bl_driver = {
 		.name	= "aat2870-backlight",
 	},
 	.probe		= aat2870_bl_probe,
-	.remove		= aat2870_bl_remove,
+	.remove_new	= aat2870_bl_remove,
 };
 
 static int __init aat2870_bl_init(void)