sockets: Rename struct inet_diag_req to inet_diag_req_v2

There was API change in linux kernel 3.2 -> 3.3 transition

 | commit c8991362a0d3cf317dfbfb6cb946607870654e6d
Reported-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>

include/inet_diag.h

@@ -34,7 +34,7 @@ struct inet_diag_req_compat {
 	__u32	idiag_dbs;		/* Tables to dump (NI) */
 };
 
-struct inet_diag_req {
+struct inet_diag_req_v2 {
 	__u8	sdiag_family;
 	__u8	sdiag_protocol;
 	__u8	idiag_ext;

sockets.c

@@ -533,7 +533,7 @@ int collect_sockets(void)
 		struct nlmsghdr hdr;
 		union {
 			struct unix_diag_req	u;
-			struct inet_diag_req i;
+			struct inet_diag_req_v2	i;
 		} r;
 	} req;