vfio: Fix container device registration life cycle

In vfio_device_open(), vfio_device_container_register() is always called
when open_count == 1. On error, vfio_device_container_unregister() is
only called when open_count == 1 and close_device is set. This leaks a
registration for devices without a close_device implementation.

In vfio_device_fops_release(), vfio_device_container_unregister() is
called unconditionally. This can cause a device to be unregistered
multiple times.

Treating container device registration/unregistration uniformly (always
when open_count == 1) fixes both issues.

Fixes: ce4b4657ff18 ("vfio: Replace the DMA unmapping notifier with a callback")
Signed-off-by: Anthony DeRossi <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Reviewed-by: Yi Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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