[readdir] ->readdir() is gone

everything's converted to ->iterate()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 6c8ef1d..78072e6 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -272,7 +272,7 @@
 		goto out;
 
 	error = -EINVAL;
-	if (!file->f_op->readdir && !file->f_op->iterate)
+	if (!file->f_op->iterate)
 		goto out_close;
 
 	buffer.name = name;