Issue #17810: return -1 on error

diff --git a/Modules/_pickle.c b/Modules/_pickle.c
index b63a7d92c54ff19f5cc04f54652d79c5ce5077c4..6de94ec1baea13755e614182ff134b4c61b9fb55 100644 (file)
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -2941,7 +2941,7 @@ save_frozenset(PicklerObject *self, PyObject *obj)
 
     iter = PyObject_GetIter(obj);
     if (iter == NULL) {
-        return NULL;
+        return -1;
     }
     for (;;) {
         PyObject *item;