Description:
------------
When parsing a tar file with duplicate filenames there is a memoryleak when registering subsequent filenames.

This is actually the same bug as has been reported https://bugs.php.net/bug.php?id=71317

attached is a patch against the php 5.6 codebase

use this file in conjunction with the attached testcase
http://download.pear.php.net/package/HTML_CSS-1.5.4.tgz

Test script:
---------------
--TEST--
Bug #71317: duplicate filenames in tar file cause memory leak
--SKIPIF--
<?php if (!extension_loaded('phar')) die('skip'); ?>
<?php if (!extension_loaded("spl")) die("skip SPL not available"); ?>
<?php if (!extension_loaded("zlib")) die("skip zlib not available"); ?>
--FILE--
<?php
$fname = str_replace('\\', '/', dirname(__FILE__) . '/files/HTML_CSS-1.5.4.tgz');
try {
	$tar = new PharData($fname);
} catch(Exception $e) {
	echo $e->getMessage() . "\n";
}
?>
===DONE===
--EXPECT--
===DONE===


Expected result:
----------------
when running with ENABLE_MAINTAINER_ZTS=1 enabled the test should report a memoryleak.