ole32/tests: remove unused assignment (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/ole32/tests/compobj.c b/dlls/ole32/tests/compobj.c
index 2d67b1e..3c35fab 100644
--- a/dlls/ole32/tests/compobj.c
+++ b/dlls/ole32/tests/compobj.c
@@ -870,7 +870,7 @@ static void test_CoRegisterClassObject(void)
 
     /* crashes with at least win9x DCOM! */
     if (0)
-        hr = CoRevokeClassObject(cookie);
+        CoRevokeClassObject(cookie);
 
     CoUninitialize();
 }