Its illegal to dereference skb after giving it to l2tp_xmit_skb()
as it might be already freed/reused.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>