multi: update to fn v2

rpcserver.go

@@ -46,7 +46,7 @@ import (
 	"github.com/lightningnetwork/lnd/contractcourt"
 	"github.com/lightningnetwork/lnd/discovery"
 	"github.com/lightningnetwork/lnd/feature"
-	"github.com/lightningnetwork/lnd/fn"
+	"github.com/lightningnetwork/lnd/fn/v2"
 	"github.com/lightningnetwork/lnd/funding"
 	"github.com/lightningnetwork/lnd/graph"
 	graphdb "github.com/lightningnetwork/lnd/graph/db"
@@ -8068,9 +8068,9 @@ func (r *rpcServer) VerifyChanBackup(ctx context.Context,
 	}
 
 	return &lnrpc.VerifyChanBackupResponse{
-		ChanPoints: fn.Map(func(c chanbackup.Single) string {
+		ChanPoints: fn.Map(channels, func(c chanbackup.Single) string {
 			return c.FundingOutpoint.String()
-		}, channels),
+		}),
 	}, nil
 }