dsound SRC bug fix

[Robert Reif]

Fixes a bug where freqAdjust was not being updated properly
when the primary buffer format changed.

This should fix some of the complaints about sound playing at the wrong 
speed.
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Index: dlls/dsound/primary.c
===================================================================
RCS file: /home/wine/wine/dlls/dsound/primary.c,v
retrieving revision 1.27
diff -i -r1.27 primary.c
343c343,344
< 	int			i;
---
> 	int i;
> 	DWORD nSamplesPerSec; 
372a374
> 	nSamplesPerSec = dsound->wfx.nSamplesPerSec;
428c430
< 	if (dsound->wfx.nSamplesPerSec != wfex->nSamplesPerSec) {
---
> 	if (nSamplesPerSec != wfex->nSamplesPerSec) {