[3.13] pythongh-135839: Fix module_traverse and module_clear in _interpchannelsmodule (pythonGH-135840) (python#135919)

(cherry picked from commit dd59c78)

Author: sobolevn

Modules/_interpchannelsmodule.c

@@ -3556,8 +3556,7 @@ module_traverse(PyObject *mod, visitproc visit, void *arg)
 {
     module_state *state = get_module_state(mod);
     assert(state != NULL);
-    traverse_module_state(state, visit, arg);
-    return 0;
+    return traverse_module_state(state, visit, arg);
 }
 
 static int
@@ -3567,8 +3566,7 @@ module_clear(PyObject *mod)
     assert(state != NULL);
 
     // Now we clear the module state.
-    clear_module_state(state);
-    return 0;
+    return clear_module_state(state);
 }
 
 static void