public synchronized DataType getReturnType() {
		long typeId = functionRecord.getLongValue(OldFunctionDBAdapter.RETURN_DATA_TYPE_ID_COL);
		DataType dt = functionManager.getDataType(typeId);
		if (dt == null) {
			dt = DataType.DEFAULT;
		}
		return dt;
	}
@see ghidra.program.model.listing.Function#getReturnType()
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/oldfunction/OldFunctionDataDB.java