<h3>Contribution description</h3>
<p>Some boards (e.g., Hifive1 with 32kHz xtimer), this test shows negative<br>
offsets. As the test doesn't do any judgement on the values anyways,<br>
change the pexpect script to allow for that.</p>
<h3>Testing procedure</h3>
<p>Ensure that tests still run as expected.</p>
<h3>Issues/PRs references</h3>
<p><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="412667777" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11041" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/11041/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/11041">#11041</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/11382'>https://github.com/RIOT-OS/RIOT/pull/11382</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>tests/xtimer_periodic_wakeup: allow for negative difference</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11382/files#diff-0">tests/xtimer_periodic_wakeup/tests/01-run.py</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11382.patch'>https://github.com/RIOT-OS/RIOT/pull/11382.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11382.diff'>https://github.com/RIOT-OS/RIOT/pull/11382.diff</a></li>
</ul>

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