isofs: switch to ->iterate_shared()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index dfd14e1..e759961 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -269,7 +269,7 @@
 {
 	.llseek = generic_file_llseek,
 	.read = generic_read_dir,
-	.iterate = isofs_readdir,
+	.iterate_shared = isofs_readdir,
 };
 
 /*