bug#64678: 28.2; dns.el: dns-read won't detect DNS packets with TC bit set

[Eli Zaretskii]

> Cc: 64678@debbugs.gnu.org
> From: Robert Pluim <rpluim@gmail.com>
> Date: Mon, 17 Jul 2023 10:51:31 +0200
> 
> >>>>> On Sun, 16 Jul 2023 20:58:03 +0200, Marc van der Wal 
> >>>>> <marc+emacs@van-der-wal.fr> said:
> 
>     Marc> Hello,
>     Marc> Due to a typo in the code, the `dns-read' function masks the wrong 
> bit
>     Marc> when looking for the TC bit in the DNS packet header. This causes
>     Marc> messages with the TC bit set to be returned with (truncated-p nil),
>     Marc> and messages with the AA bit set to have (truncated-p t).
> 
> Yep.
> 
> Eli, I guess this is small enough to commit to master as
> "Copyright-paperwork-exempt: yes"?

Yes, thanks.