[openssl/openssl] f9b7ca: return immediately if namemap is NULL

[Vladimir Kotal]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: f9b7ca18719640cb079df2c66e13fe5fea4c5f7b
      https://github.com/openssl/openssl/commit/f9b7ca18719640cb079df2c66e13fe5fea4c5f7b
  Author: Vladimír Kotal <vladimir.kotal at oracle.com>
  Date:   2023-06-18 (Sun, 18 Jun 2023)

  Changed paths:
    M crypto/core_namemap.c

  Log Message:
  -----------
  return immediately if namemap is NULL

Reviewed-by: Dmitry Belyavskiy <beldmit at gmail.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21223)

(cherry picked from commit 307cd045dccbd9ea589ff47682e39504d79644d4)