closes bpo-36115: Fix some reference leaks in typeobject.c. (GH-12045)

a24107b0 introduced a few refleaks.





https://bugs.python.org/issue36115

Objects/typeobject.c

@@ -4962,6 +4962,7 @@ add_getset(PyTypeObject *type, PyGetSetDef *gsp)
             return -1;
 
         if (PyDict_GetItemWithError(dict, PyDescr_NAME(descr))) {
+            Py_DECREF(descr);
             continue;
         }
         else if (PyErr_Occurred()) {
@@ -7689,6 +7690,7 @@ super_getattro(PyObject *self, PyObject *name)
             return res;
         }
         else if (PyErr_Occurred()) {
+            Py_DECREF(mro);
             return NULL;
         }