net: dst: provide accessor function to dst->xfrm
dst->xfrm is conditionally defined. Provide accessor funtion that is always available. Signed-off-by: NVlad Yasevich <vyasevich@gmail.com> Acked-by: NNeil Horman <nhorman@tuxdriver.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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