BUG/MINOR: ssl: memory leak when find_chain is NULL

This bug was introduced by 85888573 "BUG/MEDIUM: ssl: chain must be
initialized with sk_X509_new_null()". No need to set find_chain with
sk_X509_new_null(), use find_chain conditionally to fix issue #516.

This bug was referenced by issue #559.

[wla: fix some alignment/indentation issue]
1 file changed