[1/2] Use xfrm4_rcv in xfrm4_tunnel

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

This is a trivial patch to use xfrm4_rcv in xfrm4_tunnel.  It doesn't
need the extra argument provided by xfrm4_rcv_encap.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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