[3.13] gh-135839: Fix module_traverse and module_clear in subinterp modules (GH-135937) (GH-135943)

(cherry picked from commit bcc2cba)

Author: sobolevn

Modules/_interpqueuesmodule.c

@@ -1937,8 +1937,7 @@ static int
 module_traverse(PyObject *mod, visitproc visit, void *arg)
 {
     module_state *state = get_module_state(mod);
-    traverse_module_state(state, visit, arg);
-    return 0;
+    return traverse_module_state(state, visit, arg);
 }
 
 static int
@@ -1947,8 +1946,7 @@ module_clear(PyObject *mod)
     module_state *state = get_module_state(mod);
 
     // Now we clear the module state.
-    clear_module_state(state);
-    return 0;
+    return clear_module_state(state);
 }
 
 static void

Modules/_interpretersmodule.c

@@ -1540,17 +1540,15 @@ 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
 module_clear(PyObject *mod)
 {
     module_state *state = get_module_state(mod);
     assert(state != NULL);
-    clear_module_state(state);
-    return 0;
+    return clear_module_state(state);
 }
 
 static void