Improve xml_ReaderReset()

src/misc/xml.c

@@ -107,17 +107,21 @@ void xml_ReaderDelete(xml_reader_t *reader)
  * Resets an existing XML reader.
  * If you need to parse several XML files, this function is much faster than
  * xml_ReaderCreate() and xml_ReaderDelete() combined.
+ * If the stream parameter is NULL, the XML reader will be stopped, but
+ * not restarted until the next xml_ReaderReset() call with a non-NULL stream.
+ *
  * @param reader XML reader to reinitialize
- * @param stream new stream to read XML data from
- * @return reader on success, NULL on error (in that case, the reader is
- * destroyed).
+ * @param stream new stream to read XML data from (or NULL)
+ * @return reader on success,
+ *         NULL on error (in that case, the reader is destroyed).
  */
 xml_reader_t *xml_ReaderReset(xml_reader_t *reader, stream_t *stream)
 {
-    module_stop(reader, reader->p_module);
+    if (reader->p_stream)
+        module_stop(reader, reader->p_module);
 
     reader->p_stream = stream;
-    if (module_start(reader, reader->p_module))
+    if ((stream != NULL) && module_start(reader, reader->p_module))
     {
         vlc_object_release(reader);
         return NULL;