msacm patch

[Robert Reif]

Fixes bug when PCMWAVEFORMAT is passed into
acmStreamOpen.

Fixes bug where interpolation is done with data past end
of buffer.  A proper fix would be to project the last sample
based on the previous two but that requires significant
changes. At least it doesn't crash anymore or use random
data for the last sample.

Added TRACE and WARN where needed.
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