CID 1457825: stub version of nt_service_parse_options() makes coverity think we have dead code

 *** CID 1457825:  Possible Control flow issues  (DEADCODE)
/src/app/main/main.c: 1244 in tor_run_main()
1238         memcpy(argv + tor_cfg->argc, tor_cfg->argv_owned,
1239                tor_cfg->argc_owned*sizeof(char*));
1240     
1241       int done = 0;
1242       result = nt_service_parse_options(argc, argv, &done);
1243       if (done)
>>>     CID 1457825:  Possible Control flow issues  (DEADCODE)
>>>     Execution cannot reach this statement: "goto done;".
1244         goto done;
1245     
1246       pubsub_install();
1247     
1248       {
1249         int init_rv = tor_init(argc, argv);