[Bluetooth] Fix GATT characteristic value change listener

Function registered with addValueChangeListener was not called.

Change-Id: Ida88778e21884510fece8c30b93da265b246db2b

diff --git a/src/bluetooth/bluetooth_gatt_service.cc b/src/bluetooth/bluetooth_gatt_service.cc
index fce5b5662817cf4f1234ee6add522ff3291cee94..1171038e49e3cf5e9ae1faca73235a947525cdd4 100755 (executable)
--- a/src/bluetooth/bluetooth_gatt_service.cc
+++ b/src/bluetooth/bluetooth_gatt_service.cc
@@ -586,7 +586,7 @@ void BluetoothGATTService::OnCharacteristicValueChanged(
   }
 
   picojson::value result = picojson::value(picojson::object());
-  picojson::object result_obj = result.get<picojson::object>();
+  picojson::object& result_obj = result.get<picojson::object>();
 
   result_obj.insert(std::make_pair(kHandle, picojson::value((double)(long)characteristic)));