copy address of proc_ns_ops into ns_common

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h
index e7db1cd..ce23cf4 100644
--- a/include/linux/ns_common.h
+++ b/include/linux/ns_common.h
@@ -1,7 +1,10 @@
 #ifndef _LINUX_NS_COMMON_H
 #define _LINUX_NS_COMMON_H
 
+struct proc_ns_operations;
+
 struct ns_common {
+	const struct proc_ns_operations *ops;
 	unsigned int inum;
 };