[DSOUND] primary buffer assert fix

[Robert Reif]

Initialize primary buffer on open.

fixes random dsound->playpos < dsound->buflen asserts
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Index: dlls/dsound/primary.c
===================================================================
RCS file: /home/wine/wine/dlls/dsound/primary.c,v
retrieving revision 1.44
diff -u -p -r1.44 primary.c
--- dlls/dsound/primary.c	15 Mar 2005 15:40:36 -0000	1.44
+++ dlls/dsound/primary.c	9 Apr 2005 19:59:35 -0000
@@ -132,6 +132,9 @@ static HRESULT DSOUND_PrimaryOpen(IDirec
 
 		if (This->state == STATE_PLAYING) This->state = STATE_STARTING;
 		else if (This->state == STATE_STOPPING) This->state = STATE_STOPPED;
+		This->playpos = 0;
+		This->mixpos = 0;
+		FillMemory(This->buffer, This->buflen, (This->pwfx->wBitsPerSample == 8) ? 128 : 0);
 	}
 
 	return err;