[openssl/openssl] fa4956: Fix handling of max_fragment_length extension for PSK

[fwh-dc]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: fa495604516a610d988f02298c8d97a6ac4777bb
      https://github.com/openssl/openssl/commit/fa495604516a610d988f02298c8d97a6ac4777bb
  Author: Frederik Wedel-Heinen <frederik.wedel-heinen at dencrypt.dk>
  Date:   2024-06-20 (Thu, 20 Jun 2024)

  Changed paths:
    M include/openssl/tls1.h
    M ssl/ssl_sess.c
    M ssl/statem/extensions.c
    M ssl/statem/extensions_srvr.c
    M ssl/t1_lib.c

  Log Message:
  -----------
  Fix handling of max_fragment_length extension for PSK

A psk session was assumed to be a resumption which failed a check
when parsing the max_fragment_length extension hello from the client.

Relevant code from PR#18130 which was a suggested fix to the issue
was cherry-picked.

Fixes #18121

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Viktor Dukhovni <viktor at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24513)



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