[gtk+/filesystemmodel] Fix and tighten an assertion

[Federico Mena Quintero <federico src gnome org>]

commit e5f16d59fc0f28f70f3d289a0ab51a722f7516fe
Author: Federico Mena Quintero <federico novell com>
Date:   Wed Aug 26 19:10:51 2009 -0500

    Fix and tighten an assertion
    
    Signed-off-by: Federico Mena Quintero <federico novell com>

 gtk/gtkfilesystemmodel.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkfilesystemmodel.c b/gtk/gtkfilesystemmodel.c
index a8755f6..ca967f9 100644
--- a/gtk/gtkfilesystemmodel.c
+++ b/gtk/gtkfilesystemmodel.c
@@ -1122,8 +1122,7 @@ gtk_file_system_model_set_directory (GtkFileSystemModel *model,
                                      GFile *             dir,
 			             const gchar *       attributes)
 {
-  g_return_if_fail (GTK_IS_FILE_SYSTEM_MODEL (model));
-  g_return_if_fail (dir == NULL || G_IS_FILE (dir));
+  g_assert (G_IS_FILE (dir));
 
   model->dir = g_object_ref (dir);
   model->attributes = g_strdup (attributes);