[gtk+] treeview: fix the build

[Xan Lopez <xan src gnome org>]

commit 2c065d716b8c8b384e6c7feddd2d5e1243ec2c70
Author: Xan Lopez <xlopez igalia com>
Date:   Wed Nov 16 22:41:57 2011 +0100

    treeview: fix the build

 gtk/gtktreeview.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index cab0f52..3f32c87 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -2185,7 +2185,7 @@ gtk_tree_view_ensure_background (GtkTreeView *tree_view)
 {
   GtkStyleContext *context;
 
-  context = gtk_widget_get_style_context (widget);
+  context = gtk_widget_get_style_context (GTK_WIDGET (tree_view));
 
   gtk_style_context_save (context);
   gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);