In _PyGC_Fini(), lose the reference that was kept to the time module

pitrou · pitrou · commit 257cf2fb83bf · 2013-08-06T20:50:48.000+02:00
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
@@ -1661,6 +1661,7 @@ void
 _PyGC_Fini(void)
 {
     Py_CLEAR(callbacks);
+    Py_CLEAR(tmod);
 }
 
 /* for debugging */
