lnwallet: use fn.Set API directly instead of empty struct map.

lnwallet/channel.go

@@ -2911,8 +2911,8 @@ func (lc *LightningChannel) evaluateHTLCView(view *HtlcView, ourBalance,
 	// keep track of which entries we need to skip when creating the final
 	// htlc view. We skip an entry whenever we find a settle or a timeout
 	// modifying an entry.
-	skipUs := make(map[uint64]struct{})
+	skipUs := fn.NewSet[uint64]()
-	skipThem := make(map[uint64]struct{})
+	skipThem := fn.NewSet[uint64]()
 
 	// First we run through non-add entries in both logs, populating the
 	// skip sets.
@@ -2947,7 +2947,7 @@ func (lc *LightningChannel) evaluateHTLCView(view *HtlcView, ourBalance,
 			return nil, lntypes.Dual[[]*paymentDescriptor]{}, err
 		}
 
-		skipThem[addEntry.HtlcIndex] = struct{}{}
+		skipThem.Add(addEntry.HtlcIndex)
 
 		rmvHeight := entry.removeCommitHeights.GetForParty(
 			whoseCommitChain,
@@ -2991,7 +2991,7 @@ func (lc *LightningChannel) evaluateHTLCView(view *HtlcView, ourBalance,
 			return nil, lntypes.Dual[[]*paymentDescriptor]{}, err
 		}
 
-		skipUs[addEntry.HtlcIndex] = struct{}{}
+		skipUs.Add(addEntry.HtlcIndex)
 
 		rmvHeight := entry.removeCommitHeights.GetForParty(
 			whoseCommitChain,
@@ -3008,7 +3008,7 @@ func (lc *LightningChannel) evaluateHTLCView(view *HtlcView, ourBalance,
 	// added HTLCs.
 	for _, entry := range view.OurUpdates {
 		isAdd := entry.EntryType == Add
-		if _, ok := skipUs[entry.HtlcIndex]; !isAdd || ok {
+		if skipUs.Contains(entry.HtlcIndex) || !isAdd {
 			continue
 		}
 
@@ -3029,7 +3029,7 @@ func (lc *LightningChannel) evaluateHTLCView(view *HtlcView, ourBalance,
 	// Again, we do the same for our peer's updates.
 	for _, entry := range view.TheirUpdates {
 		isAdd := entry.EntryType == Add
-		if _, ok := skipThem[entry.HtlcIndex]; !isAdd || ok {
+		if skipThem.Contains(entry.HtlcIndex) || !isAdd {
 			continue
 		}