state: add back small comment
@@ -255,6 +255,8 @@ func (s *state) rewardAncestor(tx *database.Transaction, amount uint64, depth in
recipientBalance := readBalance(rewarded.Sender)
+ // No error is allowed here from now on.
+
writeBalance(tx.Sender, senderBalance-amount)
writeBalance(rewarded.Sender, recipientBalance+amount)
