netfilter: Allow calling into nat helper without skb_dst.
NAT checksum recalculation code assumes existence of skb_dst, which becomes a problem for a later patch in the series ("openvswitch: Interface with NAT."). Simplify this by removing the check on skb_dst, as the checksum will be dealt with later in the stack. Suggested-by: NPravin Shelar <pshelar@nicira.com> Signed-off-by: NJarno Rajahalme <jarno@ovn.org> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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