DSOUND: recover from mismatch between time spanned by primary buffer being longer than the one spanned by secondary buffer

[Alex Villací­s Lasso]

Found when trying to reach failing assertion in another dsound test. As 
far as I could deduce from the symptoms, the device buffer spans a 
longer time than the secondary buffer, and if left unchecked, this 
triggers the "Bad length in CalcPlayPosition" message. I don't really 
know if such a mismatch should be expected or whether it is an actual 
bug in dsound, but here is a quick fix for it.

Changelog:
* Recover from mismatch between time spanned by device buffer and 
secondary buffer

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

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