[openssl/openssl] eb1928: Initialize dstctx->mgf1_md to NULL in rsa_dupctx f...

[lanM]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: eb1928825869d530e7f11f2400fc27a33d8dd950
      https://github.com/openssl/openssl/commit/eb1928825869d530e7f11f2400fc27a33d8dd950
  Author: lan1120 <lanming at huawei.com>
  Date:   2023-11-30 (Thu, 30 Nov 2023)

  Changed paths:
    M providers/implementations/signature/rsa_sig.c

  Log Message:
  -----------
  Initialize dstctx->mgf1_md to NULL in rsa_dupctx function

Signed-off-by: lan1120 <lanming at huawei.com>

Reviewed-by: Todd Short <todd.short at me.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22795)

(cherry picked from commit f95e3a09173b13dcfae668be6103e64c02222f08)