dash: mpdparser: do not cleanup xml lib too early

The xmlCleanupParser function seems to cleanup all statically
allocated libxml variables, making it unusable. We can't guarantee
that dashdemux won't need it anymore, so better not call it.

ext/dash/gstmpdparser.c

@@ -2676,10 +2676,6 @@ gst_mpd_parse (GstMpdClient * client, const gchar * data, gint size)
       }
       /* free the document */
       xmlFreeDoc (doc);
-      /* cleanup function for the XML library */
-      xmlCleanupParser ();
-      /* dump XML library memory for debugging */
-      xmlMemoryDump ();
     }
     GST_MPD_CLIENT_UNLOCK (client);