usb: isp1760: rework cache initialization error handling

If we fail to create qtd cache we were not destroying the
urb_listitem, rework the error handling logic to cope with that.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Link: https://lore.kernel.org/r/20210727100516.4190681-4-rui.silva@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>