udp: unbreak build lacking CONFIG_XFRM
We must use pre-processor conditional block or suitable accessors to manipulate skb->sp elsewhere builds lacking the CONFIG_XFRM will break. Fixes: dce4551c ("udp: preserve head state for IP_CMSG_PASSSEC") Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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