[gdm] display: invert g_warn_if_fail conditionals

[Ray Strode <halfline src gnome org>]

commit 8a16520fced1633e1408a467162f4ceddaa6371c
Author: Ray Strode <rstrode redhat com>
Date:   Fri Feb 27 12:20:40 2015 -0500

    display: invert g_warn_if_fail conditionals
    
    I got them inverted in my head when I did
    
    commit 678ac9657d3166dcdeadbccb7ad9427ba0677339

 daemon/gdm-display.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index 08b6ef4..624e618 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -1215,8 +1215,8 @@ gdm_display_dispose (GObject *object)
         }
         g_clear_object (&self->priv->launch_environment);
 
-        g_warn_if_fail (self->priv->status == GDM_DISPLAY_PREPARED);
-        g_warn_if_fail (self->priv->status == GDM_DISPLAY_MANAGED);
+        g_warn_if_fail (self->priv->status != GDM_DISPLAY_PREPARED);
+        g_warn_if_fail (self->priv->status != GDM_DISPLAY_MANAGED);
         g_warn_if_fail (self->priv->user_access_file == NULL);
         g_warn_if_fail (self->priv->access_file == NULL);