hlink/tests: sign compare fix

[Austin English]

-- 
-Austin
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diff --git a/dlls/hlink/tests/hlink.c b/dlls/hlink/tests/hlink.c
index 5e07359..6981942 100644
--- a/dlls/hlink/tests/hlink.c
+++ b/dlls/hlink/tests/hlink.c
@@ -80,7 +80,7 @@ static const char *debugstr_guid(REFIID riid)
 
 static void test_HlinkIsShortcut(void)
 {
-    int i;
+    UINT i;
     HRESULT hres;
 
     static const WCHAR file0[] = {'f','i','l','e',0};