net/mlx5: E-switch, Avoid extack error log for disabled vport

net/mlx5: E-switch, Avoid extack error log for disabled vport

[ Upstream commit ae35859445607f7f18dd4f332749219cd636ed59 ]

When E-switch vport is disabled, querying its hardware address is
unsupported.
Avoid setting extack error log message in such case.

Fixes: f099fde16db3 ("net/mlx5: E-switch, Support querying port function mac address")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>