retire the stateless reset token when the session is closed

packet_handler_map.go

@@ -134,6 +134,12 @@ func (h *packetHandlerMap) AddResetToken(token [16]byte, handler packetHandler)
 	h.mutex.Unlock()
 }
 
+func (h *packetHandlerMap) RemoveResetToken(token [16]byte) {
+	h.mutex.Lock()
+	delete(h.resetTokens, token)
+	h.mutex.Unlock()
+}
+
 func (h *packetHandlerMap) RetireResetToken(token [16]byte) {
 	time.AfterFunc(h.deleteRetiredSessionsAfter, func() {
 		h.mutex.Lock()