net/mlx5: fix meter yellow policy with RSS action

net/mlx5: fix meter yellow policy with RSS action

The RSS configuration in a policy action container was a pointer
inside a union, and the pointer area could be used as other fate
action. In the current implementation, the RSS of the green color
was prior to that of the yellow color. There was a high possibility
the pointer was considered as the RSS and result in a error flow
expansion when only the yellow color had the RSS action.

The check of the fate action type should also be done to get rid of
the misjudgment.

Fixes: b38a12272b3a ("net/mlx5: split meter color policy handling")
Cc: stable@dpdk.org
Signed-off-by: Bing Zhao <bingz@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>