[gdm] manager: don't block on plymouth quitting

[Ray Strode <halfline src gnome org>]

commit f349c6c9b13775f249cbf7f5cb2f5d30af3dd00e
Author: Ray Strode <rstrode redhat com>
Date:   Thu Mar 19 22:37:24 2015 -0400

    manager: don't block on plymouth quitting
    
    plymouth can quit in the background, the only thing we need to block
    synchronously on is it deactivating.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=746498

 daemon/gdm-manager.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index 902810b..8c36e06 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -189,8 +189,7 @@ plymouth_quit_with_transition (void)
         GError  *error;
 
         error = NULL;
-        res = g_spawn_command_line_sync ("/bin/plymouth quit --retain-splash",
-                                         NULL, NULL, NULL, &error);
+        res = g_spawn_command_line_async ("/bin/plymouth quit --retain-splash", &error);
         if (! res) {
                 g_warning ("Could not quit plymouth: %s", error->message);
                 g_error_free (error);
@@ -204,8 +203,7 @@ plymouth_quit_without_transition (void)
         GError  *error;
 
         error = NULL;
-        res = g_spawn_command_line_sync ("/bin/plymouth quit",
-                                         NULL, NULL, NULL, &error);
+        res = g_spawn_command_line_async ("/bin/plymouth quit", &error);
         if (! res) {
                 g_warning ("Could not quit plymouth: %s", error->message);
                 g_error_free (error);