Fixed #67474 (getElementsByTagNameNS and default namespace)

This bug was caused by the fact that dom_get_elements_by_tag_name_ns_raw
uses an empty string to filter on the default namespace (as NULL means
'no filter'), whereas in the node itself the default namespace is
signalled by nodep->ns being null.

Author: aboks

ext/dom/php_dom.c

@@ -1345,7 +1345,7 @@ xmlNode *dom_get_elements_by_tag_name_ns_raw(xmlNodePtr nodep, char *ns, char *l
 	while (nodep != NULL && (*cur <= index || index == -1)) {
 		if (nodep->type == XML_ELEMENT_NODE) {
 			if (xmlStrEqual(nodep->name, (xmlChar *)local) || xmlStrEqual((xmlChar *)"*", (xmlChar *)local)) {
-				if (ns == NULL || (nodep->ns != NULL && (xmlStrEqual(nodep->ns->href, (xmlChar *)ns) || xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)))) {
+				if (ns == NULL || (!strcmp(ns, "") && nodep->ns == NULL) || (nodep->ns != NULL && (xmlStrEqual(nodep->ns->href, (xmlChar *)ns) || xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)))) {
 					if (*cur == index) {
 						ret = nodep;
 						break;