nl_l3::del_l3_neigh_egress(): remove created VLAN as well #449
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In add_l3_neigh_egress() we add a VLAN (reference), but we never remove it in del_l3_neigh_egress(). This creates a reference imbalance, and causes the vlan to be never deleted once there was a neighbor on an interface.
Fix this by removing the VLAN on neigh removal as well.