inet_diag: add const to inet_diag_req_v2

diag dumpers should not modify the request.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/linux/inet_diag.h
Simple merge

diff --cc net/dccp/diag.c
Simple merge

diff --cc net/ipv4/inet_diag.c
Simple merge

diff --cc net/ipv4/tcp_diag.c
Simple merge

diff --cc net/ipv4/udp_diag.c
Simple merge