not not zero means zero

svn:r4587

src/or/control.c

@@ -1426,7 +1426,7 @@ handle_control_extendcircuit(connection_t *conn, uint32_t len,
     goto done;
   }
 
-  if (!zero_circ) {
+  if (zero_circ) {
     /* start a new circuit */
     circ = circuit_init(CIRCUIT_PURPOSE_C_GENERAL, 0, 0, 0);
   }