flow_offload: Fix flow action infrastructure

Implementation of macro "flow_action_for_each" introduced in
commit e3ab786b ("flow_offload: add flow action infrastructure")
and used in commit 73867881 ("drivers: net: use flow action
infrastructure") iterated the first item twice and did not reach the
last one. Fix it.

Fixes: e3ab786b ("flow_offload: add flow action infrastructure")
Fixes: 73867881

 ("drivers: net: use flow action infrastructure")
Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>