[PATCH 2/3] winmm: MCI_SYSINFO doesn't change the output buffer in case of error.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

as opposed to mciSendString, the mciSendCommand functions appear to
obey the common convention "don't touch the output buffer in case the
function returns an error". No \0 here.

You better not use dwRetLen = 0 with the MCI.  The behaviour varies
among the 5 MCI devices, some writing upto 4 bytes (a pointer?) into
the output buffer.

Regards,
 Jörg Höhle
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