Checking whether the counter is IB counter was performed with the
wrong index.
Fixes: 859081d3fbbf ("net/mlx5: add out of buffer counter to extended statistic")
Cc: stable@dpdk.org
Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>