net/mlx5: fix meter policy creation failure handling

net/mlx5: fix meter policy creation failure handling

When an error appears in the policy creation,
the IDs mapping between the user policy ID to
the driver policy ID is skipped.

Wrongly, the driver tried to clean the mapping in
this case what caused an error.

Skip the clearance in this case.

Fixes: afb4aa4f122 ("net/mlx5: support meter policy operations")
Cc: stable@dpdk.org
Signed-off-by: Li Zhang <lizh@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>