[openssl/openssl] 8c63b1: Fix memory leak in engine_cleanup_add_first()

[Kovalev Vasily]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 8c63b14296f117b07781509ced529a8955d78fb9
      https://github.com/openssl/openssl/commit/8c63b14296f117b07781509ced529a8955d78fb9
  Author: Kovalev Vasiliy <minskij10 at yandex.ru>
  Date:   2023-05-09 (Tue, 09 May 2023)

  Changed paths:
    M crypto/engine/eng_lib.c

  Log Message:
  -----------
  Fix memory leak in engine_cleanup_add_first()

Fixes #20870

Reviewed-by: Tom Cosgrove <tom.cosgrove at arm.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20880)