[gtk+] Fix the build

[Matthias Clasen <matthiasc src gnome org>]

commit 2d9722e92ba834b19f18909a7eef5bff4834bc28
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Apr 22 11:08:17 2014 -0400

    Fix the build

 gtk/gtkmodelbutton.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkmodelbutton.c b/gtk/gtkmodelbutton.c
index 670f02f..f0e6244 100644
--- a/gtk/gtkmodelbutton.c
+++ b/gtk/gtkmodelbutton.c
@@ -595,7 +595,7 @@ gtk_model_button_init (GtkModelButton *button)
   gtk_container_add (GTK_CONTAINER (button->box), button->image);
   gtk_container_add (GTK_CONTAINER (button->box), button->label);
   gtk_container_add (GTK_CONTAINER (button), button->box);
-  gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (button), "modelbutton");
+  gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (button)), "modelbutton");
 }
 
 GtkWidget *