dsound: Avoid signed-unsigned integer comparisons

[Andrew Talbot]

Changelog:
    dsound: Avoid signed-unsigned integer comparisons.

diff --git a/dlls/dsound/primary.c b/dlls/dsound/primary.c
index dd810fd..0bfd5667 100644
--- a/dlls/dsound/primary.c
+++ b/dlls/dsound/primary.c
@@ -262,7 +262,7 @@ HRESULT DSOUND_PrimaryOpen(DirectSoundDevice *device)
 {
 	IDirectSoundBufferImpl** dsb = device->buffers;
 	LPBYTE newbuf;
-	DWORD i;
+        int i;
 
 	TRACE("(%p)\n", device);
 
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