Use zend_parse_parameters_none() in XmlWriter::openMemory()

And fix incorrect uses in tests

Author: nikic

ext/xmlwriter/php_xmlwriter.c

@@ -1700,6 +1700,10 @@ static PHP_FUNCTION(xmlwriter_open_memory)
 	zval *self = getThis();
 	ze_xmlwriter_object *ze_obj = NULL;
 
+	if (zend_parse_parameters_none() == FAILURE) {
+		return;
+	}
+
 	if (self) {
 		/* We do not use XMLWRITER_FROM_OBJECT, xmlwriter init function here */
 		ze_obj = Z_XMLWRITER_P(self);

ext/xmlwriter/tests/002.phpt

@@ -5,8 +5,7 @@ XMLWriter: libxml2 XML Writer, membuffer, flush
 --FILE--
 <?php
 
-$doc_dest = '002.xml';
-$xw = xmlwriter_open_memory($doc_dest);
+$xw = xmlwriter_open_memory();
 xmlwriter_start_document($xw, '1.0', 'UTF-8');
 xmlwriter_start_element($xw, "tag1");
 xmlwriter_end_document($xw);

ext/xmlwriter/tests/003.phpt

@@ -5,8 +5,7 @@ XMLWriter: libxml2 XML Writer, membuffer, flush, attribute
 --FILE--
 <?php
 
-$doc_dest = '003.xml';
-$xw = xmlwriter_open_memory($doc_dest);
+$xw = xmlwriter_open_memory();
 xmlwriter_start_document($xw, '1.0', 'UTF-8');
 xmlwriter_start_element($xw, "tag1");