oleaut32: Copy the value directly returned from the called function

dlls/oleaut32/tests/tmarshal.c

@@ -998,10 +998,7 @@ static void test_typelibmarshal(void)
     VariantInit(&varresult);
     hr = ITypeInfo_Invoke(pTypeInfo, &NonOleAutomation, DISPID_NOA_BSTRRET, DISPATCH_METHOD, &dispparams, &varresult, &excepinfo, NULL);
     ok_ole_success(hr, ITypeInfo_Invoke);
-    todo_wine
-    {
-        ok(V_VT(&varresult) == VT_BSTR, "V_VT(&varresult) should be VT_BSTR instead of %d\n", V_VT(&varresult));
-    }
+    ok(V_VT(&varresult) == VT_BSTR, "V_VT(&varresult) should be VT_BSTR instead of %d\n", V_VT(&varresult));
     ok(V_BSTR(&varresult) != NULL, "V_BSTR(&varresult) should not be NULL\n");
 
     VariantClear(&varresult);

dlls/oleaut32/typelib.c

@@ -5689,6 +5689,19 @@ static HRESULT WINAPI ITypeInfo_fnInvoke(
                     }
                 }
             }
+            if (V_VT(&varresult) != VT_ERROR)
+            {
+                TRACE("varresult value: ");
+                dump_Variant(&varresult);
+
+                if (pVarResult)
+                {
+                    VariantClear(pVarResult);
+                    *pVarResult = varresult;
+                }
+                else
+                    VariantClear(&varresult);
+            }
 
 func_fail:
             HeapFree(GetProcessHeap(), 0, buffer);