[3.14] gh-156909: Fix AST.__repr__ call getting the _fields attribute (GH-157490) (GH-157596) (GH-159232)

(cherry picked from commit ad0a18a)

Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: 3 people

Parser/asdl_c.py

@@ -1577,8 +1577,8 @@ def visitModule(self, mod):
         return PyUnicode_FromFormat("%s(...)", Py_TYPE(self)->tp_name);
     }
 
-    PyObject *fields;
-    if (PyObject_GetOptionalAttr((PyObject *)Py_TYPE(self), state->_fields, &fields) < 0) {
+    PyObject *fields = PyObject_GetAttr((PyObject *)Py_TYPE(self), state->_fields);
+    if (!fields) {
         Py_ReprLeave((PyObject *)self);
         return NULL;
     }