multi: pass reset to GraphSession

graph/db/kv_store.go

@@ -3977,8 +3977,8 @@ func (c *KVStore) IsClosedScid(scid lnwire.ShortChannelID) (bool, error) {
 
 // GraphSession will provide the call-back with access to a NodeTraverser
 // instance which can be used to perform queries against the channel graph.
-func (c *KVStore) GraphSession(cb func(graph NodeTraverser) error) error {
-	reset := func() {}
+func (c *KVStore) GraphSession(cb func(graph NodeTraverser) error,
+	reset func()) error {
 
 	return c.db.View(func(tx walletdb.ReadTx) error {
 		return cb(&nodeTraverserSession{