Unit test failure on FreeBSD 7.1 at test.c:1053
From my [buildbot output](https://buildbot.vidalia-project.net/builders/kore.freebsd-7.1.tor-master/builds/6493/steps/test/logs/stdio):
```
rend_fns: Aug 07 08:14:10.791 [info] rend_encode_v2_descriptors(): Successfully encoded a v2 descriptor and confirmed that it is parsable.
Aug 07 08:14:10.791 [warn] Introduction point onion port "0" is invalid
FAIL test.c:1053: assert((rend_parse_introduction_points(parsed, intro_points_encrypted, intro_points_size)) == (3)): -1 vs 3
[rend_fns FAILED]
```
issue