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

This reverts commit 0ab03c2b14.

It breaks several things including the avahi daemon.

Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/inet_diag.c

@@ -858,7 +858,7 @@ static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 	    nlmsg_len(nlh) < hdrlen)
 		return -EINVAL;
 
-	if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
+	if (nlh->nlmsg_flags & NLM_F_DUMP) {
 		if (nlmsg_attrlen(nlh, hdrlen)) {
 			struct nlattr *attr;