[gdm] launch-environment: only pass on XAUTHORITY if set

[Ray Strode <halfline src gnome org>]

commit 5b50d76d2ddf454f297653a392b2cffdb077d795
Author: Ray Strode <rstrode redhat com>
Date:   Fri Feb 20 14:47:30 2015 -0500

    launch-environment: only pass on XAUTHORITY if set
    
    It's not set in a number cases now, so trying to
    send it along, leads to log spew.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=744764

 daemon/gdm-launch-environment.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gdm-launch-environment.c b/daemon/gdm-launch-environment.c
index d35e125..dc73ffc 100644
--- a/daemon/gdm-launch-environment.c
+++ b/daemon/gdm-launch-environment.c
@@ -254,7 +254,8 @@ build_launch_environment (GdmLaunchEnvironment *launch_environment,
                                               system_data_dirs));
         g_free (system_data_dirs);
 
-        g_hash_table_insert (hash, g_strdup ("XAUTHORITY"), g_strdup 
(launch_environment->priv->x11_authority_file));
+        if (launch_environment->priv->x11_authority_file != NULL)
+                g_hash_table_insert (hash, g_strdup ("XAUTHORITY"), g_strdup 
(launch_environment->priv->x11_authority_file));
 
         g_hash_table_insert (hash, g_strdup ("LOGNAME"), g_strdup (launch_environment->priv->user_name));
         g_hash_table_insert (hash, g_strdup ("USER"), g_strdup (launch_environment->priv->user_name));