[openssl/openssl] 665104: Fix a logic flaw in test_mod_exp_zero

[Bernd Edlinger]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 6651044b4d8ae2dd13c8db8e9396d04ee0fbec9c
      https://github.com/openssl/openssl/commit/6651044b4d8ae2dd13c8db8e9396d04ee0fbec9c
  Author: Bernd Edlinger <bernd.edlinger at hotmail.de>
  Date:   2022-12-21 (Wed, 21 Dec 2022)

  Changed paths:
    M test/exptest.c

  Log Message:
  -----------
  Fix a logic flaw in test_mod_exp_zero

Due to the logic flaw, possible test failures
in this test case might be ignored.

Reviewed-by: Shane Lontis <shane.lontis at oracle.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19929)

(cherry picked from commit 42061268ee8f9ae0555d522870740fc91b744f4f)