Fix fabric-bridge-app crash (project-chip#34893)

Author: tehampson

examples/fabric-bridge-app/linux/RpcServer.cpp

@@ -118,8 +118,11 @@ pw::Status FabricBridge::AddSynchronizedDevice(const chip_rpc_SynchronizedDevice
         return pw::Status::Unknown();
     }
 
+    BridgedDevice * addedDevice = BridgeDeviceMgr().GetDeviceByNodeId(nodeId);
+    VerifyOrDie(addedDevice);
+
     CHIP_ERROR err = EcosystemInformation::EcosystemInformationServer::Instance().AddEcosystemInformationClusterToEndpoint(
-        device->GetEndpointId());
+        addedDevice->GetEndpointId());
     VerifyOrDie(err == CHIP_NO_ERROR);
 
     return pw::OkStatus();