Bluetooth: fix an error code in hci_register_dev()

Preserve the error code from hci_register_suspend_notifier().  Don't
return success.

Fixes: d6bb2a91f95b ("Bluetooth: Unregister suspend with userchannel")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_core.c

@@ -2647,7 +2647,8 @@ int hci_register_dev(struct hci_dev *hdev)
 	hci_sock_dev_event(hdev, HCI_DEV_REG);
 	hci_dev_hold(hdev);
 
-	if (hci_register_suspend_notifier(hdev))
+	error = hci_register_suspend_notifier(hdev);
+	if (error)
 		goto err_wqueue;
 
 	queue_work(hdev->req_workqueue, &hdev->power_on);