em_ipset: use dev_net() accessor

Randy found that if network namespace not enabled then
nd_net does not exist and would cause compilation failure.

This is handled correctly by using the dev_net() macro.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/em_ipset.c b/net/sched/em_ipset.c
index 1ac41d3..527aeb7 100644
--- a/net/sched/em_ipset.c
+++ b/net/sched/em_ipset.c
@@ -24,7 +24,7 @@
 {
 	struct xt_set_info *set = data;
 	ip_set_id_t index;
-	struct net *net = qdisc_dev(tp->q)->nd_net;
+	struct net *net = dev_net(qdisc_dev(tp->q));
 
 	if (data_len != sizeof(*set))
 		return -EINVAL;
@@ -46,7 +46,7 @@
 {
 	const struct xt_set_info *set = (const void *) em->data;
 	if (set) {
-		ip_set_nfnl_put(qdisc_dev(p->q)->nd_net, set->index);
+		ip_set_nfnl_put(dev_net(qdisc_dev(p->q)), set->index);
 		kfree((void *) em->data);
 	}
 }