device-dax: Drop an empty .remove callback

The dax core properly handles a dax driver not having a remove callback.
So drop it without changing the effective behaviour.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210205222842.34896-5-uwe@kleine-koenig.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dax/device.c

@@ -452,15 +452,9 @@ int dev_dax_probe(struct dev_dax *dev_dax)
 }
 EXPORT_SYMBOL_GPL(dev_dax_probe);
 
-static int dev_dax_remove(struct dev_dax *dev_dax)
-{
-	/* all probe actions are unwound by devm */
-	return 0;
-}
-
 static struct dax_device_driver device_dax_driver = {
 	.probe = dev_dax_probe,
-	.remove = dev_dax_remove,
+	/* all probe actions are unwound by devm, so .remove isn't necessary */
 	.match_always = 1,
 };