[Bug 291506] libusb_open advisory lock (libusb compatiblity)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291506

--- Comment #4 from unitrunker <unitrunker@unitrunker.net> ---
The usbgrab tool can be used to illustrate the problem.

Invoking 'usbgrab <vid> <pid>' will return after opening one device.

Assuming only one such device is attached, adding the "-a" to grab all such
devices returns with 32 devices. There is a hard limit on a maximum of 32
devices before usbgrab stops. There is in fact only one such device but
libusb_open_with_vid_pid returns the same device 32 times.

libusb client software depends upon:
a. libusb_open returning an error for a device already in use. 
b. libusb_open_with_vid_pid NOT returning a device already in use.

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