mmc: dw_mmc: rockchip: Obviously always return success in remove callback

dw_mci_pltfm_remove() returns 0 unconditionally and returning an error
in a platform remove callback isn't very sensible. (The only effect of
the latter is that the device core emits a generic warning and then
removes the device anyhow.)

So return 0 unconditionally to make it obvious there is no error
forwarded to the upper layers.

This is a preparation for making platform remove callbacks return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220610211257.102071-3-u.kleine-koenig@pengutronix.deSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/dw_mmc-rockchip.c

@@ -377,7 +377,9 @@ static int dw_mci_rockchip_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
 
-	return dw_mci_pltfm_remove(pdev);
+	dw_mci_pltfm_remove(pdev);
+
+	return 0;
 }
 
 static const struct dev_pm_ops dw_mci_rockchip_dev_pm_ops = {