Currently, if the pvid is not set, we return an illegal vlan value
even though the pvid value is set to 0. Since pvid of 0 is currently
invalid, just return 0 instead. This makes the current and future
checks simpler.
Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>