WINMM: prevent division by zero in mciwave

[Alex Villací­s Lasso]

This was found while digging for the source of the mp3 jittering 
problem. Both native L3CODECA.ACM and winemp3 trigger this 
division-by-zero exception with ACMAPP.EXE demonstration program from 
MSDN when using the Player! menu item with a MP3-encoded .WAV file 
unless this patch is applied.

Changelog:

* Prevent division-by-zero exception on codecs that do not report 
bits-per-sample.

Alex Villacís Lasso

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