Coverity fixes

covID 1445689 Resource leak (in error path)
covID 1445318 Resource leak (in test - minor)
covID 1443705 Unchecked return value (Needed if CRYPTO_atomic_add() was used)
covID 1443691 Resource leak (in app - minor)

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9071)