py: Use MP_OBJ_NULL instead of NULL when appropriate.

1 files changed, 2 insertions, 2 deletions

diff --git a/py/objdict.c b/py/objdict.c
index 725c708c2..31e538bbf 100644
--- a/py/objdict.c
+++ b/py/objdict.c
@@ -251,7 +251,7 @@ STATIC mp_obj_t dict_fromkeys(mp_uint_t n_args, const mp_obj_t *args) {
     mp_obj_t iter = mp_getiter(args[1]);
     mp_obj_t len = mp_obj_len_maybe(iter);
     mp_obj_t value = mp_const_none;
-    mp_obj_t next = NULL;
+    mp_obj_t next = MP_OBJ_NULL;
     mp_obj_t self_out;
 
     if (n_args > 2) {
@@ -374,7 +374,7 @@ STATIC mp_obj_t dict_update(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw
         } else {
             // update from a generic iterable of pairs
             mp_obj_t iter = mp_getiter(args[1]);
-            mp_obj_t next = NULL;
+            mp_obj_t next = MP_OBJ_NULL;
             while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
                 mp_obj_t inneriter = mp_getiter(next);
                 mp_obj_t key = mp_iternext(inneriter);