[openssl/openssl] 1dbfd7: fuzz: fix coverity warnings

[Catena cyber]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 1dbfd7fe24bcd50117bc57942b2046e483a3c5a5
      https://github.com/openssl/openssl/commit/1dbfd7fe24bcd50117bc57942b2046e483a3c5a5
  Author: Philippe Antoine <p.antoine at catenacyber.fr>
  Date:   2023-02-20 (Mon, 20 Feb 2023)

  Changed paths:
    M ssl/record/methods/tls_common.c
    M ssl/statem/extensions_srvr.c
    M ssl/statem/statem_lib.c

  Log Message:
  -----------
  fuzz: fix coverity warnings

introduced by 2b9e2afc382490592078cdb69d06f54f0fefd4c6

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Todd Short <todd.short at me.com>
(Merged from https://github.com/openssl/openssl/pull/20253)