fix bug #48601 (xpath() returns FALSE for legitimate query)

add test

ext/simplexml/simplexml.c

@@ -1258,13 +1258,10 @@ SXE_METHOD(xpath)
 	}
 
 	result = retval->nodesetval;
-	if (!result) {
-		xmlXPathFreeObject(retval);
-		RETURN_FALSE;
-	}
 
 	array_init(return_value);
 
+	if (result != NULL) {
 		for (i = 0; i < result->nodeNr; ++i) {
 			nodeptr = result->nodeTab[i];
 			if (nodeptr->type == XML_TEXT_NODE || nodeptr->type == XML_ELEMENT_NODE || nodeptr->type == XML_ATTRIBUTE_NODE) {
@@ -1285,6 +1282,7 @@ SXE_METHOD(xpath)
 				add_next_index_zval(return_value, value);
 			}
 		}
+	}
 
 	xmlXPathFreeObject(retval);
 }

ext/simplexml/tests/bug48601.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Bug #48601 (xpath() returns FALSE for legitimate query)
+--SKIPIF--
+<?php if (!extension_loaded("simplexml")) print "skip"; ?>
+--FILE--
+<?php
+
+$sxe = simplexml_load_string('<root><node1>1</node1></root>');
+
+$nodes = $sxe->xpath("/root/node2/@test");
+
+if (! is_array($nodes)) {
+    echo "An error occured\n";
+} else {
+   echo "Result Count: " . count($nodes) . "\n";
+}
+
+?>
+--EXPECTF--
+Result Count: 0