Add a helper to allocate tcp_md5sig_info, that will help later to
do/allocate things when info allocated, once per socket.
Signed-off-by: NDmitry Safonov <dima@arista.com>
Reviewed-by: NEric Dumazet <edumazet@google.com>
Acked-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>