Fix NULL pointer crash in OQS KEM encaps/decaps error handling#184

dstebila merged 2 commits intoopen-quantum-safe:OQS-v10open-quantum-safe/openssh:OQS-v10from

andrewyounkers:bugfix/OQS_KEM_caps_crashandrewyounkers/openssh:bugfix/OQS_KEM_caps_crashCopy head branch name to clipboard