<p>Fix typo of preprocess_split_main.cpp</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href='https://github.com/mlpack/mlpack/pull/665'>https://github.com/mlpack/mlpack/pull/665</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>fix typo</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/665/files#diff-0">src/mlpack/methods/preprocess/preprocess_split_main.cpp</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/665.patch'>https://github.com/mlpack/mlpack/pull/665.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/665.diff'>https://github.com/mlpack/mlpack/pull/665.diff</a></li>
</ul>

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