node: fix stopping websocket rpc.Server (ethereum#23211)

Author: Evolution404

node/rpcstack.go

@@ -251,7 +251,7 @@ func (h *httpServer) doStop() {
 
 	// Shut down the server.
 	httpHandler := h.httpHandler.Load().(*rpcHandler)
-	wsHandler := h.httpHandler.Load().(*rpcHandler)
+	wsHandler := h.wsHandler.Load().(*rpcHandler)
 	if httpHandler != nil {
 		h.httpHandler.Store((*rpcHandler)(nil))
 		httpHandler.server.Stop()