Remove invalid fake channels check.

We no longer need to check for confirmed channels
so now we return empty map instead to satisfy the client.
This is untill we will release a new client that doesn't use this endpoint at all.

server.go

@@ -206,18 +206,13 @@ func (s *server) CheckChannels(ctx context.Context, in *lspdrpc.Encrypted) (*lsp
 		log.Printf("proto.Unmarshal(%x) error: %v", data, err)
 		return nil, fmt.Errorf("proto.Unmarshal(%x) error: %w", data, err)
 	}
-	notFakeChannels, err := getNotFakeChannels(nodeID, checkChannelsRequest.FakeChannels)
-	if err != nil {
-		log.Printf("getNotFakeChannels(%v) error: %v", checkChannelsRequest.FakeChannels, err)
-		return nil, fmt.Errorf("getNotFakeChannels(%v) error: %w", checkChannelsRequest.FakeChannels, err)
-	}
 	closedChannels, err := node.client.GetClosedChannels(nodeID, checkChannelsRequest.WaitingCloseChannels)
 	if err != nil {
 		log.Printf("GetClosedChannels(%v) error: %v", checkChannelsRequest.FakeChannels, err)
 		return nil, fmt.Errorf("GetClosedChannels(%v) error: %w", checkChannelsRequest.FakeChannels, err)
 	}
 	checkChannelsReply := lspdrpc.CheckChannelsReply{
-		NotFakeChannels: notFakeChannels,
+		NotFakeChannels: make(map[string]uint64),
 		ClosedChannels:  closedChannels,
 	}
 	dataReply, err := proto.Marshal(&checkChannelsReply)
@@ -249,23 +244,6 @@ func (s *server) CheckChannels(ctx context.Context, in *lspdrpc.Encrypted) (*lsp
 	return &lspdrpc.Encrypted{Data: encrypted}, nil
 }
 
-func getNotFakeChannels(nodeID string, channelPoints map[string]uint64) (map[string]uint64, error) {
-	r := make(map[string]uint64)
-	if len(channelPoints) == 0 {
-		return r, nil
-	}
-	channels, err := confirmedChannels(nodeID)
-	if err != nil {
-		return nil, err
-	}
-	for channelPoint, chanID := range channels {
-		if _, ok := channelPoints[channelPoint]; ok {
-			r[channelPoint] = chanID
-		}
-	}
-	return r, nil
-}
-
 func NewGrpcServer(configs []*NodeConfig, address string, certmagicDomain string) (*server, error) {
 	if len(configs) == 0 {
 		return nil, fmt.Errorf("no nodes supplied")