usb-host: workaround libusb bug
libusb seems to no allways call the completion callback for requests canceled (which it is supposed to do according to the docs). So add a limit to avoid qemu waiting forever. Tested-by: NBALATON Zoltan <balaton@eik.bme.hu> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Message-Id: <20200529072225.3195-1-kraxel@redhat.com>
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