net: fix two coding style issues

This is a simple cleanup addressing two coding style issues found by
checkpatch.pl in an earlier patch. It's submitted as a separate patch to
keep the original patch as it was generated by spatch.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index 2fb7643..33fefb0 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -348,7 +348,8 @@ static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
 		struct rtnexthop *nhp;
 		struct nlattr *mp_head;
 
-		if (!(mp_head = nla_nest_start_noflag(skb, RTA_MULTIPATH)))
+		mp_head = nla_nest_start_noflag(skb, RTA_MULTIPATH);
+		if (!mp_head)
 			goto errout;
 
 		for_nexthops(fi) {