FDs passed from rte_mp_msg are duplicated to the secondary process and
need to be closed.
Fixes: 9a8ab29b84 ("net/mlx5: replace IPC socket with EAL API")
Cc: stable@dpdk.org
Signed-off-by: Long Li <longli@microsoft.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>