[Bug 231322] libusb_bulk_transfer() does not fail (with LIBUSB_ERROR_NO_DEVICE) if the device is not more present

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231322

            Bug ID: 231322
           Summary: libusb_bulk_transfer() does not fail (with
                    LIBUSB_ERROR_NO_DEVICE) if the device is not more
                    present
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: ludovic.rousseau+freebsd at gmail.com

After a USB device has been removed I can (try to) send a USB packet using
libusb_bulk_transfer(). The program then blocks instead of returning an error.

I get the logs:
LIBUSB_FUNCTION: libusb_bulk_transfer enter
LIBUSB_FUNCTION: libusb_submit_transfer enter
dev: 0x28c09b80
pxfer0: 0x28c2f0f0
pxfer1: 0x28c2f12c
LIBUSB_FUNCTION: libusb_submit_transfer leave 0
LIBUSB_FUNCTION: libusb_handle_events_timeout_completed enter
LIBUSB_FUNCTION: libusb10_handle_events_sub enter

I added the dev and pxfer* logs.

Then the program is blocked until I kill it using Ctrl-C.

Under GNU/Linux libusb_bulk_transfer() returns the error
LIBUSB_ERROR_NO_DEVICE.

Maybe libusb_bulk_transfer() or libusb_submit_transfer() would check the USB
device is still present.

I can test patches. The problem is easy to reproduce for me.

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