[openssl/openssl] cc90ba: Fix verify_callback in the openssl s_client/s_serv...

[beldmit]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.openssl.org/openssl/openssl
  Commit: cc90ba66062afc27e31e403613711dba5a7475a8
      https://github.openssl.org/openssl/openssl/commit/cc90ba66062afc27e31e403613711dba5a7475a8
  Author: Dmitry Belyavskiy <beldmit at gmail.com>
  Date:   2022-07-20 (Wed, 20 Jul 2022)

  Changed paths:
    M apps/lib/s_cb.c

  Log Message:
  -----------
  Fix verify_callback in the openssl s_client/s_server app

We need to check that error cert is available before printing its data

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb at siemens.com>
Reviewed-by: Viktor Dukhovni <viktor at openssl.org>
Reviewed-by: Hugo Landau <hlandau at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18805)

(cherry picked from commit fad0f80eff188ef938fed614245a56ed56110deb)