When a hotplug callback has been registered, and the program using
libusb is calling libusb_exit then the thread handler is set to
NO_THREAD which result in the variable controlling the loop the be set
to 0, it does a last pass through device available without having done
a scan, which result in a sigbus after it tried to unregister all the
devices.
directly break the loop instead and cleanup the list of devices
this fixes the tests with LGPLed libusb's hotplugtest program
MFC After: 3 days
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D48298
(cherry picked from commit ba5834b8e11fd002a663d083a464e397e76cb3a9)
devices are enumerated regardless of of the LIBUSB_HOTPLUG_ENUMERATE
flag. Make sure when the flag is not specified no arrival events are
generated for currently enumerated devices.
MFC after: 3 days
Sponsored by: Mellanox Technologies
libusb_hotplug_deregister_callback() for the LibUSB v1.0 API and
update the libusb(3) manual page.
Approved by: re (kib)
Requested by: swills
MFC after: 1 week
