[gtk+] check button: Fix inconsistent state

[Matthias Clasen <matthiasc src gnome org>]

commit b379ca3e028bc9059c966afbcb1a5a7e70b9c147
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 25 11:27:16 2017 -0500

    check button: Fix inconsistent state
    
    This has been broken since the inconsistent state
    was moved here in 2aea8dfee97b.

 gtk/gtkcheckbutton.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcheckbutton.c b/gtk/gtkcheckbutton.c
index d67b686..c15881e 100644
--- a/gtk/gtkcheckbutton.c
+++ b/gtk/gtkcheckbutton.c
@@ -562,8 +562,10 @@ gtk_check_button_set_inconsistent (GtkCheckButton *check_button,
   g_return_if_fail (GTK_IS_CHECK_BUTTON (check_button));
 
   inconsistent = !!inconsistent;
-  if (inconsistent != priv->inconsistent)
+  if (priv->inconsistent != inconsistent)
     {
+      priv->inconsistent = inconsistent;
+
       if (inconsistent)
         gtk_widget_set_state_flags (GTK_WIDGET (check_button), GTK_STATE_FLAG_INCONSISTENT, FALSE);
       else