[gtk+] gdkdisplay: Warn if asked for a non-zero screen not a zero screen

[Rob Bradford <rbradford src gnome org>]

commit 000ed99f3dcf93ffd06b52dc6ce2cd0b71249564
Author: Rob Bradford <rob linux intel com>
Date:   Tue Apr 2 12:04:22 2013 +0100

    gdkdisplay: Warn if asked for a non-zero screen not a zero screen
    
    Following on from a6b29d73 this commit correctly warn if you try and use
    deprecated multiple screen behaviour.

 gdk/gdkdisplay.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkdisplay.c b/gdk/gdkdisplay.c
index 20ea9b4..1cec8bb 100644
--- a/gdk/gdkdisplay.c
+++ b/gdk/gdkdisplay.c
@@ -1449,7 +1449,7 @@ gdk_display_get_screen (GdkDisplay *display,
                        gint        screen_num)
 {
   g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
-  g_return_val_if_fail (screen_num != 0, NULL);
+  g_return_val_if_fail (screen_num == 0, NULL);
 
   return gdk_display_get_default_screen (display);
 }