[totem] lib: Fix warning when there's no reason set

[Bastien Nocera <hadess src gnome org>]

commit 111c7d7a9539ed904c535634c56ac5f79debfed3
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Feb 22 23:29:02 2011 +0000

    lib: Fix warning when there's no reason set
    
    And D-Bus shows up.

 lib/totem-scrsaver.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/lib/totem-scrsaver.c b/lib/totem-scrsaver.c
index bbb4046..07c21c2 100644
--- a/lib/totem-scrsaver.c
+++ b/lib/totem-scrsaver.c
@@ -230,7 +230,8 @@ screensaver_update_dbus_presence (TotemScrsaver *scr)
 		g_free (name_owner);
 
 		/* screensaver just appeared, or reappeared */
-		screensaver_disable_dbus (scr);
+		if (priv->reason != NULL)
+			screensaver_disable_dbus (scr);
 	} else {
 		priv->have_screensaver_dbus = FALSE;
 	}