can: mscan: mpc5xxx_can: 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 ignored (apart from
emitting a warning) 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. Eventually after all drivers are converted, .remove_new() is
renamed to .remove().

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>
Link: https://lore.kernel.org/r/20230512212725.143824-13-u.kleine-koenig@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/mscan/mpc5xxx_can.c

@@ -349,7 +349,7 @@ static int mpc5xxx_can_probe(struct platform_device *ofdev)
 	return err;
 }
 
-static int mpc5xxx_can_remove(struct platform_device *ofdev)
+static void mpc5xxx_can_remove(struct platform_device *ofdev)
 {
 	const struct of_device_id *match;
 	const struct mpc5xxx_can_data *data;
@@ -365,8 +365,6 @@ static int mpc5xxx_can_remove(struct platform_device *ofdev)
 	iounmap(priv->reg_base);
 	irq_dispose_mapping(dev->irq);
 	free_candev(dev);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM
@@ -437,7 +435,7 @@ static struct platform_driver mpc5xxx_can_driver = {
 		.of_match_table = mpc5xxx_can_table,
 	},
 	.probe = mpc5xxx_can_probe,
-	.remove = mpc5xxx_can_remove,
+	.remove_new = mpc5xxx_can_remove,
 #ifdef CONFIG_PM
 	.suspend = mpc5xxx_can_suspend,
 	.resume = mpc5xxx_can_resume,