fixup zero out pyrouter methods so it won't be called

Author: jiridanek

src/router_pynode.c

@@ -458,10 +458,10 @@ qd_error_t qd_router_python_setup(qd_router_t *router)
 void qd_router_python_free(qd_router_t *router) {
     qd_python_lock_state_t ls = qd_python_lock();
     Py_XDECREF(pyRouter);
-    Py_XDECREF(pyTick);
-    Py_XDECREF(pySetMobileSeq);
-    Py_XDECREF(pySetMyMobileSeq);
-    Py_XDECREF(pyLinkLost);
+    Py_CLEAR(pyTick);
+    Py_CLEAR(pySetMobileSeq);
+    Py_CLEAR(pySetMyMobileSeq);
+    Py_CLEAR(pyLinkLost);
     PyGC_Collect();
     qd_python_unlock(ls);
 }