[NETNS]: Do not include net/net_namespace.h from seq_file.h

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 4a37037..6c9a48a 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -61,6 +61,8 @@
 
 
 #ifdef CONFIG_NET
+#include <linux/seq_file_net.h>
+
 /* Init's network namespace */
 extern struct net init_net;
 #define INIT_NET_NS(net_ns) .net_ns = &init_net,