[gxml] XParser: Removing warnings

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 0891866d8c4ed5fc050b542b4a09d2b267d502ee
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Oct 24 15:40:44 2017 -0500

    XParser: Removing warnings

 gxml/XParser.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gxml/XParser.vala b/gxml/XParser.vala
index 7143443..71a42c4 100644
--- a/gxml/XParser.vala
+++ b/gxml/XParser.vala
@@ -655,7 +655,7 @@ public class GXml.XParser : Object, GXml.Parser {
       write_node (n);
     }
   }
-  private void write_node (DomNode n) {
+  private void write_node (DomNode n) throws GLib.Error {
     if (tw == null)
       throw new ParserError.INVALID_DATA_ERROR (_("Internal Error: No TextWriter initialized"));
     int size = 0;