chainntnfs: remove mempool option from RegisterSpendNtfn

chainntnfs/btcdnotify/btcd.go

@@ -416,10 +416,9 @@ out:
 					rem := make(map[uint64]*spendNotification)
 					for c, ntfn := range clients {
 						// If this is a mempool spend,
-						// and this client didn't want
-						// to be notified on mempool
-						// spends, store it for later.
-						if !confirmedSpend && !ntfn.mempool {
+						// store the client to wait for
+						// a confirmed spend.
+						if !confirmedSpend {
 							rem[c] = ntfn
 							continue
 						}
@@ -673,8 +672,6 @@ type spendNotification struct {
 
 	spendID uint64
 
-	mempool bool
-
 	heightHint uint32
 }
 
@@ -694,14 +691,13 @@ type spendCancel struct {
 // across the 'Spend' channel. The heightHint should represent the earliest
 // height in the chain where the transaction could have been spent in.
 func (b *BtcdNotifier) RegisterSpendNtfn(outpoint *wire.OutPoint,
-	heightHint uint32, mempool bool) (*chainntnfs.SpendEvent, error) {
+	heightHint uint32) (*chainntnfs.SpendEvent, error) {
 
 	ntfn := &spendNotification{
 		targetOutpoint: outpoint,
 		spendChan:      make(chan *chainntnfs.SpendDetail, 1),
 		spendID:        atomic.AddUint64(&b.spendClientCounter, 1),
 		heightHint:     heightHint,
-		mempool:        mempool,
 	}
 
 	select {