channeldb+routing: remove tx arg for ForEachNode

rpcserver.go

@@ -4594,7 +4594,7 @@ func (r *rpcServer) DescribeGraph(ctx context.Context,
 	// First iterate through all the known nodes (connected or unconnected
 	// within the graph), collating their current state into the RPC
 	// response.
-	err := graph.ForEachNode(nil, func(_ kvdb.ReadTx, node *channeldb.LightningNode) error {
+	err := graph.ForEachNode(func(_ kvdb.ReadTx, node *channeldb.LightningNode) error {
 		nodeAddrs := make([]*lnrpc.NodeAddress, 0)
 		for _, addr := range node.Addresses {
 			nodeAddr := &lnrpc.NodeAddress{
@@ -4909,7 +4909,7 @@ func (r *rpcServer) GetNetworkInfo(ctx context.Context,
 	// network, tallying up the total number of nodes, and also gathering
 	// each node so we can measure the graph diameter and degree stats
 	// below.
-	if err := graph.ForEachNode(nil, func(tx kvdb.ReadTx, node *channeldb.LightningNode) error {
+	if err := graph.ForEachNode(func(tx kvdb.ReadTx, node *channeldb.LightningNode) error {
 		// Increment the total number of nodes with each iteration.
 		numNodes++