[libchamplain] Fix 594003: invalid write of size 4

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

commit 209f9f85b0528063bca9a233da9e6841166ffba4
Author: Felix Riemann <friemann gnome org>
Date:   Thu Sep 3 08:36:14 2009 -0400

    Fix 594003: invalid write of size 4

 champlain/champlain-cache.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/champlain/champlain-cache.c b/champlain/champlain-cache.c
index 505440e..ca9f99d 100644
--- a/champlain/champlain-cache.c
+++ b/champlain/champlain-cache.c
@@ -431,7 +431,9 @@ champlain_cache_fill_tile (ChamplainCache *self,
   if (priv->popularity_id == 0)
   {
     g_object_ref (self);
-    priv->popularity_id = g_idle_add (inc_popularity, self);
+    priv->popularity_id = g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
+                                           inc_popularity, self,
+                                           g_object_unref);
   }
 
 cleanup:
@@ -479,7 +481,6 @@ inc_popularity (gpointer data)
 
   if (priv->popularity_queue == NULL)
     {
-      g_object_unref (cache);
       priv->popularity_id = 0;
       return FALSE;
     }