l2tp: Refactor the codes with existing macros instead of literal number
Use PPP_ALLSTATIONS, PPP_UI, and SEND_SHUTDOWN instead of 0xff, 0x03, and 2 separately. Signed-off-by: NGao Feng <fgao@ikuai8.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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