[gnome-system-monitor] Use directly GdkEventButton in a callback

[Stefano Facchini <sfacchini src gnome org>]

commit eea6f9c0c349cfa3c4b760e7f8224b4b36740587
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Tue Aug 13 15:24:04 2013 +0200

    Use directly GdkEventButton in a callback

 src/treeview.c |   12 +++++-------
 1 files changed, 5 insertions(+), 7 deletions(-)
---
diff --git a/src/treeview.c b/src/treeview.c
index 4d1fecc..119a31b 100644
--- a/src/treeview.c
+++ b/src/treeview.c
@@ -102,16 +102,14 @@ gsm_tree_view_get_column_from_id (GsmTreeView *tree_view, gint sort_id)
 }
 
 static gboolean
-cb_column_header_clicked (GtkTreeViewColumn* column, GdkEvent* event, gpointer data)
+cb_column_header_clicked (GtkTreeViewColumn *column, GdkEventButton *event, gpointer data)
 {
     GtkMenu *menu = GTK_MENU (data);
 
-    if (event->button.button == GDK_BUTTON_SECONDARY) {
-        gtk_menu_popup (menu, NULL, NULL,
-                        NULL,
-                        &(event->button),
-                        event->button.button,
-                        event->button.time);
+    if (event->button == GDK_BUTTON_SECONDARY) {
+        gtk_menu_popup (menu, NULL, NULL, NULL, NULL,
+                        event->button,
+                        event->time);
         return TRUE;
     }