rpc: fix double reference in CallContext unmarshal #26701
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Closes #26700.
Removes the redundant
&from thejson.Unmarshalcall inCallContext. This function already checks thatresultis eithernilor a pointer type, so the extra reference operator is unnecessary. This actually causes a bug wherenulls are not unmarshalled correctly intojson.RawMessage(see original ticket for details).Added a test case to check that
nulls are properly unmarshalled.Feedback and comments are welcome and appreciated!