[libgxps] Fixed memory leak when parsing a ImageBrush element fails

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 2bb45e1566fb03bf3bb5fd3b9ad96eec54da9a2a
Author: Jason Crain <jason aquaticape us>
Date:   Sun Jan 8 14:23:14 2012 -0600

    Fixed memory leak when parsing a ImageBrush element fails
    
    A GXPSBrushImage struct is leaked when parsing fails for a child
    element of a ImageBrush.  Parsing is aborted when invalid data is
    encountered and cleanup code is not run.  This adds a error handler to
    the brush_image GMarkupParser to free the struct on error.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=668969

 libgxps/gxps-brush.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/libgxps/gxps-brush.c b/libgxps/gxps-brush.c
index 1b4e00a..b573bd5 100644
--- a/libgxps/gxps-brush.c
+++ b/libgxps/gxps-brush.c
@@ -386,11 +386,21 @@ brush_image_end_element (GMarkupParseContext  *context,
         }
 }
 
+static void
+brush_image_error (GMarkupParseContext *context,
+		   GError              *error,
+		   gpointer             user_data)
+{
+	GXPSBrushImage *image = (GXPSBrushImage *)user_data;
+	gxps_brush_image_free (image);
+}
+
 static GMarkupParser brush_image_parser = {
         brush_image_start_element,
         brush_image_end_element,
         NULL,
-        NULL
+        NULL,
+        brush_image_error
 };
 
 static GXPSBrushVisual *