note a bug that karsten found

svn:r15236

src/or/circuituse.c

@@ -743,6 +743,7 @@ circuit_build_failed(origin_circuit_t *circ)
                "(%s:%d). I'm going to try to rotate to a better connection.",
                n_conn->_base.address, n_conn->_base.port);
       n_conn->_base.or_is_obsolete = 1;
+      /* XXX021 consider setting n_conn->socket_error to TIMEOUT */
       entry_guard_register_connect_status(n_conn->identity_digest, 0,
                                           time(NULL));
     }