[libgxps] Fixed memory leak when parsing fails for a child element of a Canvas

[Carlos Garcia Campos <carlosgc src gnome org>]

commit bff39ad37b3c0624f7e95ba72867df99f2661134
Author: Jason Crain <jason aquaticape us>
Date:   Fri Dec 23 23:50:44 2011 -0600

    Fixed memory leak when parsing fails for a child element of a Canvas
    
    A GXPSCanvas struct is leaked when parsing fails for a child element
    of a Canvas.  Parsing is aborted when invalid data is encountered and
    cleanup code is not run.  This adds a error handler to the canvas
    GMarkupParser to free the struct on error.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=668965

 libgxps/gxps-page.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/libgxps/gxps-page.c b/libgxps/gxps-page.c
index ea614b5..c1dfb7e 100644
--- a/libgxps/gxps-page.c
+++ b/libgxps/gxps-page.c
@@ -357,11 +357,21 @@ canvas_end_element (GMarkupParseContext  *context,
 	}
 }
 
+static void
+canvas_error (GMarkupParseContext *context,
+              GError              *error,
+              gpointer             user_data)
+{
+	GXPSCanvas *canvas = (GXPSCanvas *)user_data;
+	gxps_canvas_free (canvas);
+}
+
 static GMarkupParser canvas_parser = {
 	canvas_start_element,
 	canvas_end_element,
 	NULL,
-	NULL
+	NULL,
+	canvas_error
 };
 
 static void