MCIWAVE: prevent division by zero when processing non-PCM codec

[Alex Villací­s Lasso]

The following test app:

http://www.palosanto.com/~a_villacis/acmapp.tar.bz2

can make msacm crash with a division by zero when opening a WAV file 
with a non-PCM codec, and then selecting the "Player!" menu option. This 
app is one sample of the Visual Studio 6 samples.

One file on which this sample crashes is the following one (MP3 codec):

http://www.palosanto.com/~a_villacis/WorldsApart.wav

Patch attached to fix this bug.

Changelog:
* Prevent division by zero on processing of non-PCM codec

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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