net/mlx5: remove assert un-accessible from secondary process

net/mlx5: remove assert un-accessible from secondary process

Verbs structs such as ibv_mr are not accessible from the secondary
process.

Choose to remove the assert in favor of performing more checks on the
critical data path.

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>