[gnome-flashback] display-config: fix crash

[Alberts Muktupāvels <muktupavels src gnome org>]

commit ad1030fc8905bf64966104a3629ef90d69479be6
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 29 18:47:35 2015 +0300

    display-config: fix crash

 .../libdisplay-config/flashback-display-config.c   |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gnome-flashback/libdisplay-config/flashback-display-config.c 
b/gnome-flashback/libdisplay-config/flashback-display-config.c
index c80a008..c5a649d 100644
--- a/gnome-flashback/libdisplay-config/flashback-display-config.c
+++ b/gnome-flashback/libdisplay-config/flashback-display-config.c
@@ -48,6 +48,7 @@ static const double known_diagonals[] = { 12.1, 13.3, 15.6 };
 
 static void
 power_save_mode_changed (MetaDBusDisplayConfig *skeleton,
+                         GParamSpec            *pspec,
                          gpointer               user_data)
 {
   FlashbackDisplayConfig *config;