ci (device_config): output line number from embedded config object

tests/test_device_config.py

@@ -530,7 +530,7 @@ def test_config_files_parse(mocker):
             # check entities are unique
             if entity.config_id in entities:
                 pytest.fail(
-                    f"\n::error file={fname},line={entity.__line__}::"
+                    f"\n::error file={fname},line={entity._config.__line__}::"
                     "Duplicate entity {entity.config_id} in {cfg}"
                 )
             entities.append(entity.config_id)