<p>Some warning fixes.</p>

<hr>

<h4>You can merge this Pull Request by running</h4>
<pre>  git pull https://github.com/ricardomaraschini/monitoring-plugins fixes</pre>
<p>Or view, comment on, or merge it at:</p>
<p>  <a href='https://github.com/monitoring-plugins/monitoring-plugins/pull/1227'>https://github.com/monitoring-plugins/monitoring-plugins/pull/1227</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>lib/utils_base.c: if asprintf fails, string is undefined</li>
  <li>plugins/utils.h: avoiding warnings on empty printf statements</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/monitoring-plugins/monitoring-plugins/pull/1227/files#diff-0">lib/utils_base.c</a>
    (15)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/monitoring-plugins/monitoring-plugins/pull/1227/files#diff-1">plugins/utils.h</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/monitoring-plugins/monitoring-plugins/pull/1227.patch'>https://github.com/monitoring-plugins/monitoring-plugins/pull/1227.patch</a></li>
  <li><a href='https://github.com/monitoring-plugins/monitoring-plugins/pull/1227.diff'>https://github.com/monitoring-plugins/monitoring-plugins/pull/1227.diff</a></li>
</ul>

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