What we can do: Add a second `ret` variable and check them both:

    ret = libusb_interrupt_transfer(..., ENDPOINT_OUT, ...);
    ret2 = libusb_interrupt_transfer(..., ENDPOINT_IN, ...);
    if (ret != 0 || ret2 != 0)
           ...

or check them individually, so we wouldn't run into the timeout
for the second transfer if the first already failed:

    ret = libusb_interrupt_transfer(..., ENDPOINT_OUT, ...);
    if (ret != 0)
           ...
    ret = libusb_interrupt_transfer(..., ENDPOINT_IN, ...);
    if (ret != 0)
           ...

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