netfilter: nf_tables: introduce nft_validate_register_load()

Change nft_validate_input_register() to not only validate the input
register number, but also the length of the load, and rename it to
nft_validate_register_load() to reflect that change.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --cc include/net/netfilter/nf_tables.h
Simple merge

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

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

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

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

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

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

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

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

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

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