DSOUND_PrimarySetFormat overwrites format on failure

[Torbjörn Söderstedt]

DSOUND_PrimarySetFormat will copy the new format before checking if it is supported. If changing format fails 
without causing DSERR_BUFFERLOST, the buffer will have incorrect settings. I created a temporary buffer that is used 
by the affected code.

The Typing of the Dead tries to set a format with nBlockAlign=0 (wBitsPerSample=2), leading to a division by zero in 
DSOUND_MixInBuffer. Bug 2361 might be related, but I can't reproduce.
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