Make closing dbus buses actually work

diff --cc src/ChangeLog
index bcaa0fd,bcaa0fd..0afc5d3
--- 1/src/ChangeLog
--- 2/src/ChangeLog
+++ b/src/ChangeLog
@@@ -1,3 -1,3 +1,11 @@@
++2014-02-16  Daniel Colascione  <dancol@dancol.org>
++
++      * dbusbind.c (xd_lisp_dbus_to_dbus): New function.
++      (xd_get_connection_address): Use it.
++      (xd_close_bus): Use xd_lisp_dbus_to_dbus to instead of
++      xd_get_connection_address because the latter signals if the bus
++      we're trying to close is already disconnected.
++
  2014-02-13  Eli Zaretskii  <eliz@gnu.org>
  
        * w32proc.c (start_timer_thread): Pass a non-NULL pointer as last

diff --cc src/dbusbind.c
index 5680eac,5680eac..f6df510
--- 1/src/dbusbind.c
--- 2/src/dbusbind.c
+++ b/src/dbusbind.c
@@@ -973,6 -973,6 +973,13 @@@ xd_get_connection_references (DBusConne
    return *refcount;
  }
  
++/* Convert a Lisp dbus object to a pointer */
++static DBusConnection*
++xd_lisp_dbus_to_dbus (Lisp_Object bus)
++{
++  return (DBusConnection *) (intptr_t) XFASTINT (bus);
++}
++
  /* Return D-Bus connection address.  BUS is either a Lisp symbol,
     :system or :session, or a string denoting the bus address.  */
  static DBusConnection *
@@@ -985,7 -985,7 +992,7 @@@ xd_get_connection_address (Lisp_Object 
    if (NILP (val))
      XD_SIGNAL2 (build_string ("No connection to bus"), bus);
    else
--    connection = (DBusConnection *) (intptr_t) XFASTINT (val);
++    connection = xd_lisp_dbus_to_dbus (val);
  
    if (!dbus_connection_get_is_connected (connection))
      XD_SIGNAL2 (build_string ("No connection to bus"), bus);
@@@ -1080,14 -1080,14 +1087,21 @@@ xd_close_bus (Lisp_Object bus
  {
    DBusConnection *connection;
    Lisp_Object val;
++  Lisp_Object busobj;
  
    /* Check whether we are connected.  */
    val = Fassoc (bus, xd_registered_buses);
    if (NILP (val))
      return;
  
++  busobj = CDR_SAFE(val);
++  if (NILP (val)) {
++    xd_registered_buses = Fdelete (val, xd_registered_buses);
++    return;
++  }
++
    /* Retrieve bus address.  */
--  connection = xd_get_connection_address (bus);
++  connection = xd_lisp_dbus_to_dbus (busobj);
  
    if (xd_get_connection_references (connection) == 1)
      {