Bluetooth: discard bt_sock_unregister() errors

After we successfully registered a socket via bt_sock_register() there is
no reason to ever check the return code of bt_sock_unregister(). If
bt_sock_unregister() fails, it means the socket _is_ already unregistered
so we have what we want, don't we?

Also, to get bt_sock_unregister() to fail, another part of the kernel has
to unregister _our_ socket. This is sooo _wrong_ that it will break way
earlier than when we unregister our socket.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index c23bae8..3786ddc 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -1065,8 +1065,7 @@
 
 	debugfs_remove(rfcomm_sock_debugfs);
 
-	if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
-		BT_ERR("RFCOMM socket layer unregistration failed");
+	bt_sock_unregister(BTPROTO_RFCOMM);
 
 	proto_unregister(&rfcomm_proto);
 }