[gtk+] colorbutton: fix crash when destroying the colorbutton from the color-set signal

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 75ef6096c1a9717949410d3e819d053e28b530ed
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Wed Jan 8 14:37:57 2014 +0100

    colorbutton: fix crash when destroying the colorbutton from the color-set signal

 gtk/gtkcolorbutton.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcolorbutton.c b/gtk/gtkcolorbutton.c
index ae9afd1..027b384 100644
--- a/gtk/gtkcolorbutton.c
+++ b/gtk/gtkcolorbutton.c
@@ -567,6 +567,7 @@ dialog_response (GtkDialog *dialog,
 
       gtk_widget_queue_draw (button->priv->draw_area);
 
+      g_object_ref (button);
       g_signal_emit (button, color_button_signals[COLOR_SET], 0);
 
       g_object_freeze_notify (G_OBJECT (button));
@@ -574,6 +575,7 @@ dialog_response (GtkDialog *dialog,
       g_object_notify (G_OBJECT (button), "alpha");
       g_object_notify (G_OBJECT (button), "rgba");
       g_object_thaw_notify (G_OBJECT (button));
+      g_object_unref (button);
     }
 }