[gtk+] filechooserbutton: Don't leak priv->model

[Timm Bäder <baedert src gnome org>]

commit d292ebc7bd6c96fffdaf6d3579b6048c7d9f5479
Author: Timm Bäder <mail baedert org>
Date:   Fri Oct 6 17:14:31 2017 +0200

    filechooserbutton: Don't leak priv->model

 gtk/gtkfilechooserbutton.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkfilechooserbutton.c b/gtk/gtkfilechooserbutton.c
index 48d13cb..e868e04 100644
--- a/gtk/gtkfilechooserbutton.c
+++ b/gtk/gtkfilechooserbutton.c
@@ -1059,6 +1059,8 @@ gtk_file_chooser_button_finalize (GObject *object)
   if (priv->current_folder_while_inactive)
     g_object_unref (priv->current_folder_while_inactive);
 
+  g_object_unref (priv->model);
+
   gtk_widget_unparent (priv->button);
   gtk_widget_unparent (priv->combo_box);