winmm: Fix sum of available samples.

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

Hi,

That error caused too little data to be written to the device at every
timer interrupt, increasing the likeliness of underruns and stuttering.

Note that I've still not checked the WHDR_LOOP code.

Regards,
	Jörg Höhle.
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