[openssl/openssl] 784126: CMP: correct handling of fallback subject in OSSL_...

[David von Oheimb]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 784126f117eb31d0296f839db1f426385312845a
      https://github.com/openssl/openssl/commit/784126f117eb31d0296f839db1f426385312845a
  Author: Dr. David von Oheimb <David.von.Oheimb at siemens.com>
  Date:   2022-08-24 (Wed, 24 Aug 2022)

  Changed paths:
    M crypto/cmp/cmp_msg.c
    M doc/man1/openssl-cmp.pod.in
    M doc/man3/OSSL_CMP_MSG_get0_header.pod

  Log Message:
  -----------
  CMP: correct handling of fallback subject in OSSL_CMP_CTX_setup_CRM() and its doc

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb at siemens.com>
(Merged from https://github.com/openssl/openssl/pull/18929)

(cherry picked from commit 7af110f9f5fb9b039cc09b63768a0b989a7bf5ad)