Merge remote-tracking branch 'public/bug23690_028' into maint-0.2.8

src/or/circuitlist.c

@@ -1939,6 +1939,7 @@ single_conn_free_bytes(connection_t *conn)
   if (conn->outbuf) {
     result += buf_allocation(conn->outbuf);
     buf_clear(conn->outbuf);
+    conn->outbuf_flushlen = 0;
   }
   if (conn->type == CONN_TYPE_DIR) {
     dir_connection_t *dir_conn = TO_DIR_CONN(conn);