mmdevapi/tests: Fix wrong buffer unit and memory leaks.

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

Hi,

* nBlockAlign is wrong since data is counted in frames, not bytes.

CoTaskMemFree was missing after GetMixFormat.  However, I doubt that
corresponds to the Valgrind leaks mentioned in bug #26135.  What I
know for sure is that there are other small leaks, e.g. GetMixFormat
is called internally by mmdevapi:devenum.c:set_format, and some not
related to GetMixFormat.
I'm wondering why Austin's bug report doesn't list them.

Regards,
 Jörg Höhle
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