multi: add SpewLogClosure to avoid code repetition

routing/payment_session.go

@@ -5,7 +5,6 @@ import (
 
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btclog"
-	"github.com/davecgh/go-spew/spew"
 	"github.com/lightningnetwork/lnd/build"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/channeldb/models"
@@ -433,7 +432,7 @@ func (p *paymentSession) UpdateAdditionalEdge(msg *lnwire.ChannelUpdate,
 	policy.FeeProportionalMillionths = lnwire.MilliSatoshi(msg.FeeRate)
 
 	log.Debugf("New private channel update applied: %v",
-		lnutils.NewLogClosure(func() string { return spew.Sdump(msg) }))
+		lnutils.SpewLogClosure(msg))
 
 	return true
 }

routing/router.go

@@ -670,10 +670,7 @@ func (r *ChannelRouter) FindRoute(req *RouteRequest) (*route.Route, float64,
 	}
 
 	go log.Tracef("Obtained path to send %v to %x: %v",
-		req.Amount, req.Target, lnutils.NewLogClosure(func() string {
-			return spew.Sdump(route)
-		}),
-	)
+		req.Amount, req.Target, lnutils.SpewLogClosure(route))
 
 	return route, probability, nil
 }
@@ -1091,11 +1088,8 @@ func (r *ChannelRouter) sendToRoute(htlcHash lntypes.Hash, rt *route.Route,
 		return nil, err
 	}
 
-	log.Tracef("Dispatching SendToRoute for HTLC hash %v: %v",
-		htlcHash, lnutils.NewLogClosure(func() string {
-			return spew.Sdump(rt)
-		}),
-	)
+	log.Tracef("Dispatching SendToRoute for HTLC hash %v: %v", htlcHash,
+		lnutils.SpewLogClosure(rt))
 
 	// Since the HTLC hashes and preimages are specified manually over the
 	// RPC for SendToRoute requests, we don't have to worry about creating