mmdevapi: After GetBuffer, refuse Reset, but Start/Stop is ok.

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

Hi,

My tests show that Reset cannot destroy the state prepared by GetBuffer.

My tests also show that a GetBuffer/ReleaseBuffer pair is left
undisturbed by Stop/Start in between. Fortunately, this
has no effect on the current code (but it shows that Stop must
not change This->held_frames or the write_pos).

As a result, the recommended shutdown order for an interrupted
app in unknown state is:
ReleaseBuffer(0)
Stop()
Reset() is superfluous
Release()

Regards,
 Jörg Höhle
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