multi: add NewLogClosure in lnutils to avoid repetition

And replaces all usage of `logClosure` with `lnutils.LogClosure`.

sweep/sweeper.go

@@ -13,6 +13,7 @@ import (
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/input"
+	"github.com/lightningnetwork/lnd/lnutils"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 )
@@ -1376,7 +1377,7 @@ func (s *UtxoSweeper) handleInputSpent(spend *chainntnfs.SpendDetail) {
 
 		log.Debugf("Detected third party spend related to in flight "+
 			"inputs (is_ours=%v): %v", isOurTx,
-			newLogClosure(func() string {
+			lnutils.NewLogClosure(func() string {
 				return spew.Sdump(spend.SpendingTx)
 			}),
 		)