gh-94401: Remove unneeded overlapped module state (#94403)

Modules/overlapped.c

@@ -105,18 +105,6 @@ typedef struct {
     };
 } OverlappedObject;
 
-typedef struct {
-    PyTypeObject *overlapped_type;
-} OverlappedState;
-
-static inline OverlappedState*
-overlapped_get_state(PyObject *module)
-{
-    void *state = PyModule_GetState(module);
-    assert(state != NULL);
-    return (OverlappedState *)state;
-}
-
 
 static inline void
 steal_buffer(Py_buffer * dst, Py_buffer * src)
@@ -1996,28 +1984,6 @@ static PyMethodDef overlapped_functions[] = {
     {NULL}
 };
 
-static int
-overlapped_traverse(PyObject *module, visitproc visit, void *arg)
-{
-    OverlappedState *state = overlapped_get_state(module);
-    Py_VISIT(state->overlapped_type);
-    return 0;
-}
-
-static int
-overlapped_clear(PyObject *module)
-{
-    OverlappedState *state = overlapped_get_state(module);
-    Py_CLEAR(state->overlapped_type);
-    return 0;
-}
-
-static void
-overlapped_free(void *module)
-{
-    overlapped_clear((PyObject *)module);
-}
-
 #define WINAPI_CONSTANT(fmt, con) \
     do { \
         PyObject *value = Py_BuildValue(fmt, con); \
@@ -2045,14 +2011,15 @@ overlapped_exec(PyObject *module)
         return -1;
     }
 
-    OverlappedState *st = overlapped_get_state(module);
-    st->overlapped_type = (PyTypeObject *)PyType_FromModuleAndSpec(
+    PyTypeObject *overlapped_type = (PyTypeObject *)PyType_FromModuleAndSpec(
         module, &overlapped_type_spec, NULL);
-    if (st->overlapped_type == NULL) {
+    if (overlapped_type == NULL) {
         return -1;
     }
 
-    if (PyModule_AddType(module, st->overlapped_type) < 0) {
+    int rc = PyModule_AddType(module, overlapped_type);
+    Py_DECREF(overlapped_type);
+    if (rc < 0) {
         return -1;
     }
 
@@ -2077,14 +2044,10 @@ static PyModuleDef_Slot overlapped_slots[] = {
 };
 
 static struct PyModuleDef overlapped_module = {
-    PyModuleDef_HEAD_INIT,
+    .m_base = PyModuleDef_HEAD_INIT,
     .m_name = "_overlapped",
-    .m_size = sizeof(OverlappedState),
     .m_methods = overlapped_functions,
     .m_slots = overlapped_slots,
-    .m_traverse = overlapped_traverse,
-    .m_clear = overlapped_clear,
-    .m_free = overlapped_free
 };
 
 PyMODINIT_FUNC