Update SSL_CTX_sess_set_new_cb(3) docs for refcounts
The existing documentation for the new-session callback was unclear
about the requirements on the callback with respect to reference-handling
of the session object being created. Be more explicit about the
(non-)requirements on the callback code for "success" (1) and "ignore"
(0) return values.
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10848)
(cherry picked from commit
188d4ec82a9b0085ac5841cce3eda95efb94f2b4)