[XFRM] Don't panic in xfrm_user_init

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi:

Since xfrm_user can be built as a module it's best not to panic
when something goes wrong in xfrm_user_init.  Call me a wimp for
not fixing netlink_kernel_init's return value :)

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

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