@Override
	public void close() {
		if (txId == -1) {
			return;
		}
		cleanerDtm.endTransaction(txId, true); // faster to commit
		cleanerDtm.close();
		txId = -1; // closed indicator
	}
Clean the specified datatype
@param dt datatype
@return clean datatype
Ghidra/Features/Base/src/main/java/ghidra/program/util/DataTypeCleaner.java