Add 'Task<TOut?> DeviceIoControlAsync<TIn, TOut>(HFILE hDevice, uint ioControlCode, TIn? inVal)' for instead of 'DeviceIoControlAsync<TIn, TOut>(HFILE hDevice, uint ioControlCode, TIn? inVal, TOut? outVal)'.
Add 'Task<TOut?> DeviceIoControlAsync<TIn, TOut>(HFILE hDevice, uint ioControlCode, TIn? inVal)' for instead of 'DeviceIoControlAsync<TIn, TOut>(HFILE hDevice, uint ioControlCode, TIn? inVal, TOut? outVal)'.

dahall/vanara