[gnome-session] main: clear environment on shutdown

[Ray Strode <halfline src gnome org>]

commit bb4842dd785dc85bef4c382c391d65700d0b3f64
Author: Ray Strode <rstrode redhat com>
Date:   Wed Mar 25 15:36:38 2020 -0400

    main: clear environment on shutdown
    
    The bus daemon is going to get restarted on shutdown, so make sure
    it has a pristine environment when starting back up.

 gnome-session/main.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gnome-session/main.c b/gnome-session/main.c
index c1dda5dc..a5ce4cce 100644
--- a/gnome-session/main.c
+++ b/gnome-session/main.c
@@ -599,6 +599,10 @@ main (int argc, char **argv)
 
         gsm_main ();
 
+#ifdef HAVE_SYSTEMD
+        gsm_util_export_user_environment (NULL);
+#endif
+
         g_clear_object (&manager);
         g_free (gl_renderer);