Fix Stats.Sub() for Stats.TxN.
@ -952,7 +952,7 @@ func (s *Stats) Sub(other *Stats) Stats {
diff.PendingPageN = s.PendingPageN
diff.FreeAlloc = s.FreeAlloc
diff.FreelistInuse = s.FreelistInuse
diff.TxN = other.TxN - s.TxN
diff.TxN = s.TxN - other.TxN
diff.TxStats = s.TxStats.Sub(&other.TxStats)
return diff
}