WINEALSA: completely fill mmap buffer

[Alex Villaci­s Lasso]

In my configuration (Fedora Core 2, alsa-lib 1.0.3a-2), the available 
frames for filling do not always become an exact multiple of the period 
size. This leaves a section of the mmap buffer unfilled, and causes a 
*very* annoying buzzing when an application requests DirectSound with 
winealsa (except in emulation mode). This patch fixes it by checking 
whether a section of the buffer still remains unfilled, and fills it 
without rounding to a multiple of the period size.

Changelog:
* Completely fill mmap buffer

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