net/mlx4: fix typo in comment
net/mlx4: fix typo in comment

A spelling mistake was found in comment.
This patch fixes it.

Fixes: 8e4937640022 ("net/mlx4: add external allocator for Verbs object")
Cc: stable@dpdk.org

Signed-off-by: Dekel Peled <f1921780d3213ef78965aec36396441d9bf8894c@mellanox.com>
Acked-by: Viacheslav Ovsiienko <5b8db9bb93a9a9aefc8828f79604d1fe963a53dd@mellanox.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk