Fix dictobject.c

Author: colesbury

Objects/dictobject.c

@@ -6858,7 +6858,7 @@ _PyObject_TryGetInstanceAttribute(PyObject *obj, PyObject *name, PyObject **attr
 
 #ifdef Py_GIL_DISABLED
     PyObject *value = _Py_atomic_load_ptr_relaxed(&values->values[ix]);
-    if (value == NULL || _Py_TryIncref(&values->values[ix], value)) {
+    if (value == NULL || _Py_TryIncrefCompare(&values->values[ix], value)) {
         *attr = value;
         return 0;
     }