Fix NULL access in ssl_build_cert_chain() when ctx is NULL.

Fixes #14294

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from

Fix NULL access in ssl_build_cert_chain() when ctx is NULL.

Fixes #14294

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14295)

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