net/mlx5: fs, Remove redundant vport_number assignment

vport_number and other_vport being reassigned outside the if clause anyway.
remove the redundant assignment.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>