more trivial ->iterate_shared conversions

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index b51b371..4c5593a 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -202,7 +202,7 @@
 const struct file_operations udf_dir_operations = {
 	.llseek			= generic_file_llseek,
 	.read			= generic_read_dir,
-	.iterate		= udf_readdir,
+	.iterate_shared		= udf_readdir,
 	.unlocked_ioctl		= udf_ioctl,
 	.fsync			= generic_file_fsync,
 };