<h3>Contribution description</h3>

<p>I'd like to add an explicit cast to the module <code>gnrc/tx-sync</code> for it to build with default setting on C++ compilers.</p>
<p>cc <a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/maribu/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/maribu">@maribu</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/16441'>https://github.com/RIOT-OS/RIOT/pull/16441</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>gnrc tx-sync: add cast for c++ compatibility</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16441/files#diff-78979b785d827446a89d28292e8ca47366c7189f615128d2c84fce9c19fb6d6e">sys/include/net/gnrc/tx_sync.h</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16441.patch'>https://github.com/RIOT-OS/RIOT/pull/16441.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16441.diff'>https://github.com/RIOT-OS/RIOT/pull/16441.diff</a></li>
</ul>

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