driver core: Remove device_is_registered() in device_move().

device_is_registered() will always be false for a device with no bus. Remove
this check and trust the caller to know what they're doing.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/core.c

@@ -1004,10 +1004,6 @@ int device_move(struct device *dev, struct device *new_parent)
 	if (!dev)
 		return -EINVAL;
 
-	if (!device_is_registered(dev)) {
-		error = -EINVAL;
-		goto out;
-	}
 	new_parent = get_device(new_parent);
 	if (!new_parent) {
 		error = -EINVAL;