netns: Use net_eq() to compare net-namespaces for optimization.

Without CONFIG_NET_NS, namespace is always &init_net.
Compiler will be able to omit namespace comparisons with this patch.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index ed9acff..a6e0818 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -668,7 +668,7 @@
 	struct sctp_sockaddr_entry *temp;
 	int found = 0;
 
-	if (dev_net(ifa->ifa_dev->dev) != &init_net)
+	if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
 		return NOTIFY_DONE;
 
 	switch (ev) {