hwrng: stm32 - 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() will be 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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: Uwe Kleine-König

drivers/char/hw_random/stm32-rng.c

@@ -363,11 +363,9 @@ static int stm32_rng_init(struct hwrng *rng)
 	return 0;
 }
 
-static int stm32_rng_remove(struct platform_device *ofdev)
+static void stm32_rng_remove(struct platform_device *ofdev)
 {
 	pm_runtime_disable(&ofdev->dev);
-
-	return 0;
 }
 
 static int __maybe_unused stm32_rng_runtime_suspend(struct device *dev)
@@ -558,7 +556,7 @@ static struct platform_driver stm32_rng_driver = {
 		.of_match_table = stm32_rng_match,
 	},
 	.probe = stm32_rng_probe,
-	.remove = stm32_rng_remove,
+	.remove_new = stm32_rng_remove,
 };
 
 module_platform_driver(stm32_rng_driver);