file chooser: Avoid triggering assertions

cairo surfaces are boxed types, so don't try to set them
with g_value_set_object().

diff --git a/gtk/gtkfilechooserwidget.c b/gtk/gtkfilechooserwidget.c
index 0f39ca2ed92a834c3f558576ea2a173dcdb2d366..71f1655d5209b98ec306e98bde873952a2e6ee64 100644 (file)
--- a/gtk/gtkfilechooserwidget.c
+++ b/gtk/gtkfilechooserwidget.c
@@ -4030,7 +4030,7 @@ file_system_model_set (GtkFileSystemModel *model,
             }
         }
       else
-        g_value_set_object (value, NULL);
+        g_value_set_boxed (value, NULL);
       break;
     case MODEL_COL_SIZE:
       g_value_set_int64 (value, info ? g_file_info_get_size (info) : 0);