ppp: Cache net in pptp_xmit
Compute net and store it in a variable in pptp_xmit, so that the value can be reused the next time it is needed. Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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