(main, check_open_hook, close_device, trivfs_goaway): Add a new lock,

  device_lock, and use it to control access to the DEVICE variable.
(open_hook, trivfs_modify_stat, trivfs_S_fys_syncfs): Copy DEVICE before
  using it, so it doesn't change underneath us.
(clean_exit): Add a new argument that says whether to aquire a lock before
  doing our work.
(ports_notice_idle, ports_no_live_ports): Use it.

(close_device): New function, closes DEVICE cleanly.
(clean_exit, ports_no_hard_ports): Use close_device.

(main): Use trivfs_startup instead of doing it manually.

(trivfs_goaway): Try and do it better, paying attention to flags, etc.; this
  still isn't right though, we may want to wait for the ports library to be
  fixed first.

(DEBUG): New macro, executes its arg with debug_lock locked.

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