Stream-to-memory SGDMA does not write last QWord during a transfer

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In the 'real', 'physical' world, whatever the synthesizer choosed to do, signal in_empty[2:0] can only be "000", "001", "010", "011", "100", "101", "110" or "111".

So 1 of the 8 conditions from sgdma.vhd, line 1946, has to be true, so m_write_byteenable_reg should not be "00000000".

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I'm pretty sure the synthesizer won't choose a value for you, but will just optimise away anything that only depends on this vector if you didn't initialize it. The actual outputs that depends on this vector can therefore take any value, depending on the optimisations that have been done.