[libchamplain/libchamplain-0-4] Fix segfault when polygon has been delete before redraw

[Pierre-Luc Beaudoin <plbeaudoin src gnome org>]

commit 15d0144ab6dfc5dab94b7dae7b7be5df4815908b
Author: Pierre-Luc Beaudoin <pierre-luc pierlux com>
Date:   Tue Dec 29 16:18:37 2009 -0500

    Fix segfault when polygon has been delete before redraw

 champlain/champlain-view.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/champlain/champlain-view.c b/champlain/champlain-view.c
index 7f3f2ae..c200549 100644
--- a/champlain/champlain-view.c
+++ b/champlain/champlain-view.c
@@ -467,7 +467,7 @@ notify_polygon_cb (ChamplainPolygon *polygon,
   ctx = g_new0 (PolygonRedrawContext, 1);
   ctx->view = view;
   ctx->polygon = polygon;
-  g_object_add_weak_pointer (polygon, &ctx->polygon);
+  g_object_add_weak_pointer (G_OBJECT (polygon), (gpointer *) &ctx->polygon);
 
   view->priv->polygon_redraw_id = g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
       (GSourceFunc) redraw_polygon_on_idle, ctx, g_free);