Merge branch 'net-Remove-unused-variables'

Florian Fainelli says:

====================
Remove unused variables

This removes unused variables from mlxsw and ethsw after the recent
removal of SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS, build scripts are now
fixed to take care of those warnings :).
====================

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