bpo-39824: Convert PyModule_GetState() to get_module_state() (GH-19076)



Automerge-Triggered-By: @vstinner
diff --git a/Modules/audioop.c b/Modules/audioop.c
index 64cf981..3aeb6f0 100644
--- a/Modules/audioop.c
+++ b/Modules/audioop.c
@@ -1925,7 +1925,7 @@
 static int
 audioop_traverse(PyObject *module, visitproc visit, void *arg)
 {
-    audioop_state *state = (audioop_state *)PyModule_GetState(module);
+    audioop_state *state = get_audioop_state(module);
     Py_VISIT(state->AudioopError);
     return 0;
 }
@@ -1933,7 +1933,7 @@
 static int
 audioop_clear(PyObject *module)
 {
-    audioop_state *state = (audioop_state *)PyModule_GetState(module);
+    audioop_state *state = get_audioop_state(module);
     Py_CLEAR(state->AudioopError);
     return 0;
 }