Revert "netlink: test for all flags of the NLM_F_DUMP composite"

This reverts commit 0ab03c2b1478f2438d2c80204f7fef65b1bca9cf.

It breaks several things including the avahi daemon.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a5f7535..750db57 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1820,7 +1820,7 @@
 	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
 		return -EPERM;
 
-	if (kind == 2 && (nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
+	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 		struct sock *rtnl;
 		rtnl_dumpit_func dumpit;