Introduced with legacy/trac#32196. Found by coverity: ``` *** CID 1455207: Null pointer dereferences (FORWARD_NULL) /src/test/test_relay.c: 116 in test_relay_close_circuit() 110 if (orcirc) { 111 circuitmux_detach_circuit(nchan->cmux, TO_CIRCUIT(orcirc)); 112 circuitmux_detach_circuit(pchan->cmux, TO_CIRCUIT(orcirc)); 113 cell_queue_clear(&orcirc->base_.n_chan_cells); 114 cell_queue_clear(&orcirc->p_chan_cells); 115 } >>> CID 1455207: Null pointer dereferences (FORWARD_NULL) >>> Passing null pointer "orcirc" to "free_fake_orcirc", which dereferences it. 116 free_fake_orcirc(orcirc); ```