Fix a possible refleak in tupleobject.c (GH-19018)

(cherry picked from commit c81609e)

Co-authored-by: Hai Shi <shihai1992@gmail.com>

Author: miss-islington

Objects/tupleobject.c

@@ -696,8 +696,10 @@ tuple_subtype_new(PyTypeObject *type, PyObject *iterable)
         return NULL;
     assert(PyTuple_Check(tmp));
     newobj = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));
-    if (newobj == NULL)
+    if (newobj == NULL) {
+        Py_DECREF(tmp);
         return NULL;
+    }
     for (i = 0; i < n; i++) {
         item = PyTuple_GET_ITEM(tmp, i);
         Py_INCREF(item);