[empathy] roster-window: fix crash if empathy_chatroom_manager_find() failed

[Guillaume Desmottes <gdesmott src gnome org>]

commit a8a060fb4022f07e60a7c7f97ea1591152cb89cf
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Thu Aug 28 12:10:35 2014 +0200

    roster-window: fix crash if empathy_chatroom_manager_find() failed
    
    This function doesn't use/set a GError so we shouldn't try to use it.

 src/empathy-roster-window.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/empathy-roster-window.c b/src/empathy-roster-window.c
index 8319227..b953e0e 100644
--- a/src/empathy-roster-window.c
+++ b/src/empathy-roster-window.c
@@ -1301,9 +1301,8 @@ roster_window_join_chatroom_menu_activate_cb (GSimpleAction *action,
       account, room);
   if (chatroom == NULL)
     {
-      DEBUG ("Failed to get chatroom '%s' on '%s': %s",
-          room, path, error->message);
-      g_error_free (error);
+      DEBUG ("Failed to get chatroom '%s' on '%s'",
+          room, path);
       goto out;
     }