WINEALSA: prevent scribbling past end of structure

[Alex Villací­s Lasso]

While testing patches for MSACM, I found that winealsa crashes reliably 
whenever an attempt is made to play a MS-ADPCM file with sndPlaySound(). 
Other sound drivers (notably OSS) do not crash. The core problem is a 
memcpy that scribbles past the end of a structure into the pointer to 
the ALSA device -> random memory access -> crash. Attached patch fixes 
issue.

Changelog:
* Ensure that copy_format() will not write past end of referenced 
WAVEFORMATPCMEX structure.

Alex Villacís Lasso

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