[gtk+] Silence a compiler warning

[Matthias Clasen <matthiasc src gnome org>]

commit 8b7940c0b1b3c3c9aa643e7e924b9c948114f9e2
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 9 19:26:22 2013 -0500

    Silence a compiler warning

 gtk/gtkplacessidebar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkplacessidebar.c b/gtk/gtkplacessidebar.c
index 7401aa3..7dcfcb0 100644
--- a/gtk/gtkplacessidebar.c
+++ b/gtk/gtkplacessidebar.c
@@ -698,7 +698,7 @@ file_is_shown (GtkPlacesSidebar *sidebar,
             return TRUE;
         }
     }
-  while (gtk_tree_model_iter_next (sidebar->store, &iter));
+  while (gtk_tree_model_iter_next (GTK_TREE_MODEL (sidebar->store), &iter));
 
   return FALSE;
 }