* Check listSet->fixedListNum.
* Check listSet->fixedList for nullptr and its directory items names.
* Check listSet->focusDirName for nullptr and directory name.
* Check listSet->newData->iconPosition.
* Check listSet->newData->dirName for nullptr and directory string.
* Check statSet->setParam->parental_level for old sdk.
* Return an error if listSet->focusPosition is NEWDATA and listSet->newData is nullptr.
* Simplify savedata directory list selection.