After initializing dev->_xmit_lock register_netdevice()
sets lockdep class according to dev->type.

Idea of this patch - by David Miller.

Reported & tested by: "Yuriy N. Shkandybin" <jura@netams.com>
Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>