* dbus/dbus-connection.c (_dbus_connection_new_for_transport):
  Unlock connection on error
  (generate_local_error_message): static method for generating
  an error message when we don't have a message to reply to
  (_dbus_connection_block_pending_call): Send a disconnect error
  instead of just a timeout (NULL) when the bus gets disconnected
  while blocking for a reply.