Buffer size check when using libFTDI is wrong #33

This should be:

m_ftdi.FT_SetUSBParameters(rxSize < 256 ? 256 : rxSize , txSize);

Or at least when not in windows. On AmigaOS4 tracks size can't be set correctly when using:

m_comPort.setBufferSizes(RAW_TRACKDATA_LENGTH_DD * 2, RAW_TRACKDATA_LENGTH_DD);

And you have errors when writing to disk