[Commit 49de5431d53b](https://gitweb.torproject.org/tor.git/commitdiff/49de5431d53b4515d48a0f1c76fc53f3306f5d11) made Tor use `SSL_set_app_data` and `SSL_get_app_data` instead of its previous hash table to look up the `tor_tls_t *` object corresponding to an `SSL *` object. Unfortunately: * The patch left in two hash-table helper functions that it made unused. Reported by mobmix. * The patch did not check the result of `SSL_set_app_data` for errors. Reported by piebeer. * The `SSL_*_app_data` functions are actually macros wrapping corresponding `SSL_*_ex_data` functions in such a way that a program that tries to use the `app_data` and `ex_data` functions at the same time will break horribly.