Description:
------------
The error position is at the last character (\xef\xbc\x8c in UTF-8). If I make the string longer, the position doesn't change. If I make it one character shorter than the example, the error disappears.

I've read bug #72181 but can't reproduce that one.

My libxml2 version is 2.9.4+96+gfb56f80e-1

The XML doc for testing:

<?xml version="1.0" encoding="UTF-8"?>
<properties>
制馬吃富不國助病以孩上容留消生強德，準大指總產如戰上是個！沒目人起如物對了話外多年至性己外頭出假。在館演量難調代什如常千苦友議，學字而的響過紙看正家！玩車一，是華是體過記用說感公媽間城石也都於教行，獲驚稱重眼發工，層上由的間近要過將去資球我老來許推、種得海在中個產程的治教他院一；持一建情。你室隊花……放成動，
</properties>

Test script:
---------------
<?php
$reader = new XMLReader();
$reader->open("a.xml");
while($reader->read()) {
}

Actual result:
--------------
PHP Warning:  XMLReader::read(): /home/lilydjwg/tmp/a.xml:3: parser error : Input is not proper UTF-8, indicate encoding !
Bytes: 0xEF 0xBC EOF in /home/lilydjwg/.cache/tmp/a.php on line 4
PHP Warning:  XMLReader::read(): 在中個產程的治教他院一；持一建情。你室隊花……放成動 in /home/lilydjwg/tmp/a.php on line 4
PHP Warning:  XMLReader::read():