SIGABRT during unit tests
Looks like the additional tests introduced in dbd170f752b422004835def53f84b786f32c9a08 cause a sigabrt during the util/sscanf unit test on my OS X 10.7 machine: ``` (gdb) run --debug util/sscanf `/tor/src/test/test' has changed; re-reading symbols. Starting program: /tor/src/test/test --debug util/sscanf [info] crypto_global_init(): NOT using OpenSSL engine support. [notice] No AES engine found; using AES_* functions. [notice] This OpenSSL has a good implementation of counter mode; using it. [info] crypto_seed_rng(): Seeding RNG from "/dev/urandom" [debug] tor_disable_debugger_attach(): Attemping to disable debugger attachment to Tor for unprivileged users. [debug] parse_dir_server_line(): Trusted 100 dirserver at 128.31.0.39:9131 (9695) [debug] parse_dir_server_line(): Trusted 111 dirserver at 86.59.21.38:80 (847B) [debug] parse_dir_server_line(): Trusted 102 dirserver at 194.109.206.212:80 (7EA6) [debug] parse_dir_server_line(): Trusted 16 dirserver at 82.94.251.203:80 (4A0C) [debug] parse_dir_server_line(): Trusted 100 dirserver at 216.224.124.114:9030 (F397) [debug] parse_dir_server_line(): Trusted 100 dirserver at 212.112.245.170:80 (F204) [debug] parse_dir_server_line(): Trusted 100 dirserver at 193.23.244.244:80 (7BE6) [debug] parse_dir_server_line(): Trusted 100 dirserver at 208.83.223.34:443 (0AD3) [debug] parse_dir_server_line(): Trusted 100 dirserver at 171.25.193.9:443 (BD6A) [info] crypto_seed_rng(): Seeding RNG from "/dev/urandom" util/sscanf: Program received signal SIGABRT, Aborted. 0x00007fff88e4e82a in __kill () (gdb) bt #0 0x00007fff88e4e82a in __kill () #1 0x00007fff8ab69b6c in __abort () #2 0x00007fff8ab66070 in __stack_chk_fail () #3 0x0000000100059e15 in test_util_sscanf () at test_util.c:1500 #4 0x0000000100071712 in testcase_run_bare_ [inlined] () at /tor/src/test/tinytest.c:89 #5 0x0000000100071712 in testcase_run_one (group=0x1001bbcf0, testcase=0x6) at tinytest.c:224 #6 0x00000001000719e2 in tinytest_main (c=1606416624, v=0x7fff5fbff988, groups=0x1001bbcf0) at tinytest.c:347 #7 0x000000010000dc6c in main (c=0, v=0x7fff5fbff960) at test.c:1929 ```
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