net: revert "net: l2tp: Treat NET_XMIT_CN as success in l2tp_eth_dev_xmit"
This reverts commit 7c6ae610, because l2tp_xmit_skb() never returns NET_XMIT_CN, it ignores the return value of l2tp_xmit_core(). Cc: Gao Feng <gfree.wind@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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