Wrong success count in logs.

in the send_all function in notifications.event.inc the number of sent mails are calculated like this:

$sent = count($results['sent']);
$skip = count($results['skip']);
$success = count($results['success']);

However, while $sent and $skip are arrays with the subscription ID's, $success is not:
$results['success'] = count(array_filter($results['results']));

So $success = count($results['success']); should actually be $success = $results['success'];