[gtk+] GtkRadioButton: Allow setting group more than once

[Matthias Clasen <matthiasc src gnome org>]

commit cc529c242354475e2aee5a6176922ec7f989bdfc
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Oct 2 23:37:38 2014 -0400

    GtkRadioButton: Allow setting group more than once
    
    It turns out that GtkBuilder will sometimes set a property
    twice. Normally, this is harmless, but for GtkRadioButton:group,
    it triggered a critical. Remove that.

 gtk/gtkradiobutton.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkradiobutton.c b/gtk/gtkradiobutton.c
index f61a361..9bfc83c 100644
--- a/gtk/gtkradiobutton.c
+++ b/gtk/gtkradiobutton.c
@@ -275,7 +275,9 @@ gtk_radio_button_set_group (GtkRadioButton *radio_button,
   GtkWidget *new_group_singleton = NULL;
 
   g_return_if_fail (GTK_IS_RADIO_BUTTON (radio_button));
-  g_return_if_fail (!g_slist_find (group, radio_button));
+
+  if (g_slist_find (group, radio_button))
+    return;
 
   priv = radio_button->priv;