[openssl/openssl] bd864f: Fix a possible memory leak in custom_ext_add

[Bernd Edlinger]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: bd864f058c495d97e42007128d62f7fb19ae1818
      https://github.com/openssl/openssl/commit/bd864f058c495d97e42007128d62f7fb19ae1818
  Author: Bernd Edlinger <bernd.edlinger at hotmail.de>
  Date:   2023-11-08 (Wed, 08 Nov 2023)

  Changed paths:
    M ssl/statem/extensions_cust.c

  Log Message:
  -----------
  Fix a possible memory leak in custom_ext_add

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22639)