Merge branch 'act_tunnel_key-support-key-less-tunnels'

Or Gerlitz says:

====================
net/sched: act_tunnel_key: support key-less tunnels

This short series from Adi Nissim allows to support key-less tunnels
by the tc tunnel key actions, which is needed for some GRE use-cases.

changes from V0:
 - addresses build warning spotted by kbuild, make sure to always init
   to zero the tunnel key
====================

Signed-off-by: David S. Miller <davem@davemloft.net>