[3.12] gh-106831: Fix NULL check of d2i_SSL_SESSION() result in _ssl.c (GH-106832) (#106835)

gh-106831: Fix NULL check of d2i_SSL_SESSION() result in _ssl.c (GH-106832)
(cherry picked from commit ebf2c56b33553a448da8f60fcd89a622f071b5f4)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>