pythongh-135839: Fix module_traverse and module_clear in _interpchannelsmodule (python#135840)

Author: sobolevn

Modules/_interpchannelsmodule.c

@@ -3614,8 +3614,7 @@ module_traverse(PyObject *mod, visitproc visit, void *arg)
 {
     module_state *state = get_module_state(mod);
     assert(state != NULL);
-    (void)traverse_module_state(state, visit, arg);
-    return 0;
+    return traverse_module_state(state, visit, arg);
 }
 
 static int
@@ -3625,8 +3624,7 @@ module_clear(PyObject *mod)
     assert(state != NULL);
 
     // Now we clear the module state.
-    (void)clear_module_state(state);
-    return 0;
+    return clear_module_state(state);
 }
 
 static void