[IPSEC] Kill redundan dst_release check in xfrm_dst_destroy

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

Here's a trivial patch to get rid of a redundant check that I added
in patch 3/4.  dst_release already checks for dst == NULL.

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

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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xfrm-8
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