linux-phytec-fsl

wext: unregister_pernet_subsys() on notifier registration failure

If register_netdevice_notifier() fails (which in practice it can't
right now), we should call unregister_pernet_subsys(). Do that.

Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>