bpo-43660: Fix crash when displaying exceptions with custom values for sys.stderr (GH-25075)

Python/pythonrun.c

@@ -1082,8 +1082,9 @@ PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
     if (file == Py_None) {
         return;
     }
-
+    Py_INCREF(file);
     _PyErr_Display(file, exception, value, tb);
+    Py_DECREF(file);
 }
 
 PyObject *