[gnome-settings-daemon] xrandr: Only connect to GnomeRRScreen's signal after checking it's not NULL

[Rodrigo Moya <rodrigo src gnome org>]

commit 9b1fd55f4e65cad07a3f39de441aca53e34e7473
Author: Rodrigo Moya <rodrigo gnome-db org>
Date:   Wed Sep 21 11:47:03 2011 +0200

    xrandr: Only connect to GnomeRRScreen's signal after checking it's not NULL

 plugins/xrandr/gsd-xrandr-manager.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/plugins/xrandr/gsd-xrandr-manager.c b/plugins/xrandr/gsd-xrandr-manager.c
index 4ccf5d1..7f0fe0b 100644
--- a/plugins/xrandr/gsd-xrandr-manager.c
+++ b/plugins/xrandr/gsd-xrandr-manager.c
@@ -1861,7 +1861,6 @@ gsd_xrandr_manager_start (GsdXrandrManager *manager,
         log_msg ("------------------------------------------------------------\nSTARTING XRANDR PLUGIN\n");
 
         manager->priv->rw_screen = gnome_rr_screen_new (gdk_screen_get_default (), error);
-        g_signal_connect (manager->priv->rw_screen, "changed", G_CALLBACK (on_randr_event), manager);
 
         if (manager->priv->rw_screen == NULL) {
                 log_msg ("Could not initialize the RANDR plugin%s%s\n",
@@ -1871,6 +1870,8 @@ gsd_xrandr_manager_start (GsdXrandrManager *manager,
                 return FALSE;
         }
 
+        g_signal_connect (manager->priv->rw_screen, "changed", G_CALLBACK (on_randr_event), manager);
+
         log_msg ("State of screen at startup:\n");
         log_screen (manager->priv->rw_screen);