[openssl/openssl] 82d46d: Coverity 1515415: NULL dereference

[Pauli]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 82d46d14462491681f25d016508715e85c1dc4d1
      https://github.com/openssl/openssl/commit/82d46d14462491681f25d016508715e85c1dc4d1
  Author: Pauli <pauli at openssl.org>
  Date:   2022-09-21 (Wed, 21 Sep 2022)

  Changed paths:
    M test/helpers/ssltestlib.c

  Log Message:
  -----------
  Coverity 1515415: NULL dereference

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19236)