py: Fix "TypeError: 'iterator' object is not iterable", doh.
diff --git a/py/objtuple.c b/py/objtuple.c
index 7f14509..d6a5bb3 100644
--- a/py/objtuple.c
+++ b/py/objtuple.c
@@ -251,6 +251,7 @@
 STATIC const mp_obj_type_t mp_type_tuple_it = {
     { &mp_type_type },
     .name = MP_QSTR_iterator,
+    .getiter = mp_identity,
     .iternext = tuple_it_iternext,
 };