[openssl/openssl] 46376f: Correct tag len check when determining how much sp...

[Matt Caswell]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 46376fcf4b6d11ec417c2a530475037d4d09fcbf
      https://github.com/openssl/openssl/commit/46376fcf4b6d11ec417c2a530475037d4d09fcbf
  Author: Matt Caswell <matt at openssl.org>
  Date:   2023-11-15 (Wed, 15 Nov 2023)

  Changed paths:
    M ssl/quic/quic_record_tx.c

  Log Message:
  -----------
  Correct tag len check when determining how much space we have in the pkt

If the available space is equal to the tag length then we have no available
space for plaintext data.

Fixes #22699

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22715)