[mutter/wayland] window: Fix meta_window_ping some more

[Jasper St. Pierre <jstpierre src gnome org>]

commit ee683ff187463350cf794ff77e2c3809b13ccbcd
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Dec 6 20:23:00 2013 -0500

    window: Fix meta_window_ping some more
    
    Make sure to actually add the pings to the list... and don't
    remove it from the list twice.

 src/core/window.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index 3a3fde0..e13e0a7 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -12231,9 +12231,6 @@ meta_window_pong (MetaWindow *window,
                                           ping_data->timestamp,
                                           ping_data->user_data);
 
-          /* Remove the ping data from the list */
-          window->pending_pings = g_slist_remove (window->pending_pings, ping_data);
-
           ping_data_free (ping_data);
 
           break;
@@ -12333,6 +12330,8 @@ meta_window_ping (MetaWindow        *window,
   ping_data->user_data = user_data;
   ping_data->ping_timeout_id = g_timeout_add (PING_TIMEOUT_DELAY, ping_timeout, ping_data);
 
+  window->pending_pings = g_slist_prepend (window->pending_pings, ping_data);
+
   g_hash_table_insert (display->pending_pings, &ping_data->timestamp, window);
 
   meta_topic (META_DEBUG_PING,