netfilter: xtables: make use of caller family rather than match family

The matches can have .family = NFPROTO_UNSPEC, and though that is not
the case for the touched modules, it seems better to just use the
nfproto from the caller.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

diff --cc net/netfilter/xt_dscp.c
Simple merge

diff --cc net/netfilter/xt_hashlimit.c
Simple merge

diff --cc net/netfilter/xt_policy.c
Simple merge

diff --cc net/netfilter/xt_recent.c
Simple merge

diff --cc net/netfilter/xt_state.c
Simple merge