Fix clone CurlUrl test

Author: adoy

ext/curl/tests/curl_url_006.phpt

@@ -10,7 +10,8 @@ if (curl_version()['version_number'] < 0x073e00) die('skip requires curl >= 7.62
 <?php
 $url = curl_url('https://www.example.com/');
 $url2 = clone $url;
-echo curl_url_get($url, CURLUPART_URL);
+unset($url);
+echo curl_url_get($url2, CURLUPART_URL);
 ?>
 --EXPECT--
 https://www.example.com/