[gnome-control-center] display: Use symbolic name

[Bastien Nocera <hadess src gnome org>]

commit f75c06b9794daec6716ae7a83b5b91f52d098570
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Mar 7 17:07:31 2012 +0100

    display: Use symbolic name

 panels/display/cc-display-panel.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
index e3f392c..33846d5 100644
--- a/panels/display/cc-display-panel.c
+++ b/panels/display/cc-display-panel.c
@@ -60,7 +60,8 @@ enum {
   HEIGHT_COL,
   RATE_COL,
   AREA_COL,
-  ROTATION_COL
+  ROTATION_COL,
+  NUM_COLS
 };
 
 struct _CcDisplayPanelPrivate
@@ -2159,7 +2160,7 @@ make_text_combo (GtkWidget *widget, int sort_column)
 {
   GtkComboBox *box = GTK_COMBO_BOX (widget);
   GtkListStore *store = gtk_list_store_new (
-                                            6,
+                                            NUM_COLS,
                                             G_TYPE_STRING,          /* Text */
                                             G_TYPE_INT,             /* Width */
                                             G_TYPE_INT,             /* Height */