fix warnings

src/api-server/api/IndividualSMPolicyDocumentApi.cpp

src/api-server/api/SMPoliciesCollectionApi.cpp

src/api-server/model/AccNetChId.cpp

src/api-server/model/AccNetChargingAddress.cpp

src/api-server/model/AccessTokenErr.cpp

src/api-server/model/AccessTokenReq.cpp

src/api-server/model/AdditionalAccessInfo.cpp

src/api-server/model/AfSigProtocol.cpp

src/api-server/model/Ambr.cpp

src/api-server/model/AnGwAddress.cpp

src/api-server/model/AuthorizedDefaultQos.cpp

src/api-server/model/CellGlobalId.cpp

src/api-server/model/ChargingData.cpp

src/pcf_app/pcf_config.cpp

src/pcf_app/pcf_sm_policy_control.cpp

src/pcf_app/sm_policy/policy_storage.cpp