FDs passed from rte_mp_msg are duplicated to the secondary process and
need to be closed.
Fixes: 0203d33a10 ("net/mlx4: support secondary process")
Cc: stable@dpdk.org
Signed-off-by: Long Li <longli@microsoft.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>