switch all procfs directories ->iterate_shared()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 350984a..c8bbc68 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -179,7 +179,7 @@
 const struct file_operations proc_net_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= proc_tgid_net_readdir,
+	.iterate_shared	= proc_tgid_net_readdir,
 };
 
 static __net_init int proc_net_ns_init(struct net *net)