Ed Maste 91f986ec99 linux-v4l2: Check udev fd events
udev_event_thread calls poll with two fds: the udev fd, and an eventfd
used for shutdown.  On FreeBSD we were hanging on shutdown in
udev_monitor_receive_device after receiving the eventfd event.

Now, if the udev fd reports no events skip the
udev_monitor_receive_device call.

At shutdown the loop will exit via os_event_try().
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