The BSD-4-clause-from-Regents advertising clause is not needed anymore:
https://github.com/qca/open-ath9k-htc-firmware/commit/f6e017c06e129c289d2ebe24613c4f933a9772ad

Please drop it in d/copyright and drop the comment that you want to introduce with
https://salsa.debian.org/jscott/open-ath9k-htc-firmware/-/commit/957614de9235f2416a3054fa05d980adf7af4c35 ("The GPL is
generally regarded as incompatible with the four-clause BSD license due to the latter's advertising clause.")

We believe that the bug you reported is fixed in the latest version of
open-ath9k-htc-firmware, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1011438@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
John Scott <jscott@posteo.net> (supplier of updated open-ath9k-htc-firmware package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Thu, 01 Jul 2021 20:05:59 -0400
Source: open-ath9k-htc-firmware
Architecture: source
Version: 1.4.0-108-gd856466+dfsg1-1
Distribution: unstable
Urgency: medium
Maintainer: John Scott <jscott@posteo.net>
Changed-By: John Scott <jscott@posteo.net>
Closes: 1011438
Changes:
 open-ath9k-htc-firmware (1.4.0-108-gd856466+dfsg1-1) unstable; urgency=medium
 .
   * Add package version control info.
   * Clean up the copyright file.
     - Distinguish the BSD 3-Clause Clear variant from the conventional one.
     - Make conformant to DEP-5 specification for machine readability.
   * Build cross toolchain with Binutils 2.36 and GCC 12 with patch.
   * Drop the BSD-4 advertising clause. (Closes: #1011438)
     Thanks to Bastian Germann for coordinating this upstream.
   * Move the Salsa repo to the Debian collaborative maintenance namespace.
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