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Sometimes we might have stacked vlans on top of each other, and we're interested in the first non-vlan real device on the path, so transform vlan_dev_real_dev to go over the stacked vlans and extract the first non-vlan device. Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Signed-off-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>