[gtk+] gtkwindow: Fix a memory leak

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 12ccebe2a4b1c626a3ec02165de891445297847d
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Fri May 15 15:39:04 2015 +0200

    gtkwindow: Fix a memory leak
    
    The private data GtkGesture* drag_gesture was added by commit
    13e22e20300b7312e52bba7d077fc7e231695fc1, but it's never destroyed.
    Unref it in gtk_window_finalize().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749425

 gtk/gtkwindow.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 2a05c83..9c147fb 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -5756,6 +5756,9 @@ gtk_window_finalize (GObject *object)
   if (priv->multipress_gesture)
     g_object_unref (priv->multipress_gesture);
 
+  if (priv->drag_gesture)
+    g_object_unref (priv->drag_gesture);
+
   G_OBJECT_CLASS (gtk_window_parent_class)->finalize (object);
 }