py: Fix "TypeError: 'iterator' object is not iterable", doh.
diff --git a/py/objstr.c b/py/objstr.c
index 2dd7015..751f93a 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -885,6 +885,7 @@
 STATIC const mp_obj_type_t mp_type_str_it = {
     { &mp_type_type },
     .name = MP_QSTR_iterator,
+    .getiter = mp_identity,
     .iternext = str_it_iternext,
 };
 
@@ -903,6 +904,7 @@
 STATIC const mp_obj_type_t mp_type_bytes_it = {
     { &mp_type_type },
     .name = MP_QSTR_iterator,
+    .getiter = mp_identity,
     .iternext = bytes_it_iternext,
 };