vlan: introduce __vlan_insert_tag helper which does not free skb
There's a need for helper which inserts vlan tag but does not free the skb in case of an error. Suggested-by: NPravin Shelar <pshelar@nicira.com> Signed-off-by: NJiri Pirko <jiri@resnulli.us> Acked-by: NPravin B Shelar <pshelar@nicira.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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