ole32/tests: make sure to use a return value (LLVM/Clang)

[Austin English]

-- 
-Austin
-------------- next part --------------
diff --git a/dlls/ole32/tests/hglobalstream.c b/dlls/ole32/tests/hglobalstream.c
index 0810d9f..b2a6ee9 100644
--- a/dlls/ole32/tests/hglobalstream.c
+++ b/dlls/ole32/tests/hglobalstream.c
@@ -421,6 +421,8 @@ static void test_copyto(void)
     static const LARGE_INTEGER llZero;
     char buffer[15];
 
+    ok_ole_success(hr, "CreateStreamOnHGlobal");
+
     expected_method_list = methods_copyto;
 
     hr = IStream_Write(pStream, szHello, sizeof(szHello), &written);