Input: wm97xx - make .remove() obviously always return 0

wm97xx_remove() returns zero unconditionally. To prepare changing the
prototype for platform remove callbacks to return void, make it explicit
that wm97xx_mfd_remove() always returns zero.

The prototype for wm97xx_remove cannot be changed, as it's also used as
a plain device remove callback.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220708062718.240013-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: Uwe Kleine-König

drivers/input/touchscreen/wm97xx-core.c

@@ -786,7 +786,9 @@ static int wm97xx_mfd_probe(struct platform_device *pdev)
 
 static int wm97xx_mfd_remove(struct platform_device *pdev)
 {
-	return wm97xx_remove(&pdev->dev);
+	wm97xx_remove(&pdev->dev);
+
+	return 0;
 }
 
 static int __maybe_unused wm97xx_suspend(struct device *dev)