winealsa: Fix AudioCaptureClient Get/ReleaseBuffer protocol. (try 2)

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

Hi,

You'll find my capture tests in testbot job #16332
http://testbot.winehq.org/JobDetails.pl?Key=16332

The surprising news is that (in shared mode), GetBuffer
never returns more than a period worth of data.
GetCurrentPadding can return much larger values.

With that patch in place, winealsa produces almost the
same test results on my mmdevapi capture tests as a w7 machine
-- modulo the few todo_wine.

Try2 fixes the incorrect call to GetPosition.  Maybe it's not a
good idea to remove the call entirely, because GetPosition
has the benefit of logging all ALSA parameters -- but it not
called unconditionally.

I've ran my capture&render tests in a loop with dmix and
results were stable over hundreds of iterations.

Regards,
	Jörg Höhle
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