[NETLINK]: Correctly set NLM_F_MULTI without checking the pid

This patch rectifies some rtnetlink message builders that derive the
flags from the pid. It is now explicit like the other cases
which get it right. Also fixes half a dozen dumpers which did not
set NLM_F_MULTI at all.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index 6506dcc..b10d6bb 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -703,7 +703,8 @@
 					  &f->fn_key,
 					  fz->fz_order,
 					  fa->fa_tos,
-					  fa->fa_info) < 0) {
+					  fa->fa_info,
+					  NLM_F_MULTI) < 0) {
 				cb->args[3] = i;
 				return -1;
 			}