Fix uninitialized variable warning

Author: hhvrc

src/serialization/JsonSerial.cpp

@@ -22,7 +22,7 @@ bool JsonSerial::ParseShockerCommand(const cJSON* root, JsonSerial::ShockerComma
  OS_LOGE(TAG, "value at 'model' is not a string");
  return false;
  }
- ShockerModelType modelType;
+ ShockerModelType modelType = ShockerModelType::MIN;
  if (!ShockerModelTypeFromString(model->valuestring, modelType)) {
  OS_LOGE(TAG, "value at 'model' is not a valid shocker model (caixianlin, petrainer, petrainer998dr)");
  return false;