dmaengine: fsl_raid: 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/20230919133207.1400430-15-u.kleine-koenig@pengutronix.deSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl_raid.c

@@ -857,7 +857,7 @@ static void fsl_re_remove_chan(struct fsl_re_chan *chan)
 		      chan->oub_phys_addr);
 }
 
-static int fsl_re_remove(struct platform_device *ofdev)
+static void fsl_re_remove(struct platform_device *ofdev)
 {
 	struct fsl_re_drv_private *re_priv;
 	struct device *dev;
@@ -872,8 +872,6 @@ static int fsl_re_remove(struct platform_device *ofdev)
 
 	/* Unregister the driver */
 	dma_async_device_unregister(&re_priv->dma_dev);
-
-	return 0;
 }
 
 static const struct of_device_id fsl_re_ids[] = {
@@ -888,7 +886,7 @@ static struct platform_driver fsl_re_driver = {
 		.of_match_table = fsl_re_ids,
 	},
 	.probe = fsl_re_probe,
-	.remove = fsl_re_remove,
+	.remove_new = fsl_re_remove,
 };
 
 module_platform_driver(fsl_re_driver);