Remove extra L3 offset checks and manipulation in ofp_eth_vlan_processing().
Remove extra L3 offset checks and manipulation in ofp_eth_vlan_processing().

Assume that the caller of ofp_eth_vlan_processing() makes sure that
the packet has a valid L3 offset. Packets that come through ODP packet
parsing should be fine in this regard.

Signed-off-by: Jere Leppänen <14957520de8d9815e0c353a07fe23c737f0171e9@nokia.com>
Reviewed-by: Sorin Vultureanu <8013ba55f8675034bc2ab0d6c3a1c9650437ca36@enea.com>

OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp