Invalid #validate attribute

When I submit a form with a private upload, I receive the following error message:

"warning: function_exists() expects parameter 1 to be string, array given in /var/www/includes/form.inc on line 771."

I have tracked down the issue and propose the following solution:

Line 349 of private_upload.module reads as follows:

$form['#validate']['private_upload_form_validate'] = array('');

The Form API expects the name(s) of the form validation functions to be present in an array assocaited with $form['#validate']. So, the correct code looks as follows:

$form['#validate'][] = 'private_upload_form_validate';