[gtk+/gtk-3-16] tooltip: Minor cleanup

[Matthias Clasen <matthiasc src gnome org>]

commit 2984dcdbe57e49ea20e1c2ecbe391073364bb918
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 22 11:47:23 2015 -0400

    tooltip: Minor cleanup
    
    Preserve the symmetry in gtk_tooltip_set_last_window.

 gtk/gtktooltip.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktooltip.c b/gtk/gtktooltip.c
index fa4c8b6..fd2ba14 100644
--- a/gtk/gtktooltip.c
+++ b/gtk/gtktooltip.c
@@ -904,7 +904,7 @@ gtk_tooltip_set_last_window (GtkTooltip *tooltip,
 
   tooltip->last_window = window;
 
-  if (window)
+  if (tooltip->last_window)
     g_object_add_weak_pointer (G_OBJECT (tooltip->last_window),
                               (gpointer *) &tooltip->last_window);