[openssl/openssl] 33796d: Coverity 1515415: NULL dereference

[Pauli]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 33796db4a5c3ea68ae80530dcbff60222c5a2008
      https://github.com/openssl/openssl/commit/33796db4a5c3ea68ae80530dcbff60222c5a2008
  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)

(cherry picked from commit 82d46d14462491681f25d016508715e85c1dc4d1)