As promised here is the patch that moves dst_release out of
dst->ops->check.  It bloats sk_dst_check/__sk_dst_check slightly
but they're only used in a handful of places so it isn't too bad.
I actually counted, it's about a few hundred bytes.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>