nft: Keep nft_handle pointer in nft_xt_ctx

Instead of carrying the family value, carry the handle (which contains
the family value) and relieve expression parsers from having to call
nft_family_ops_lookup().

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
2 files changed