ddfs gc: cleanup some parts of code.
ddfs gc: cleanup some parts of code.

seabirdzh/disco,pooya/disco,seabirdzh/disco,pombredanne/disco,oldmantaiter/disco,ErikDubbelboer/disco,pooya/disco,ErikDubbelboer/disco,beni55/disco,ktkt2009/disco,pombredanne/disco,discoproject/disco,ktkt2009/disco,mwilliams3/disco,oldmantaiter/disco,ktkt2009/disco,pombredanne/disco,ErikDubbelboer/disco,oldmantaiter/disco,simudream/disco,pombredanne/disco,oldmantaiter/disco,discoproject/disco,seabirdzh/disco,ktkt2009/disco,discoproject/disco,discoproject/disco,mozilla/disco,mozilla/disco,seabirdzh/disco,seabirdzh/disco,simudream/disco,oldmantaiter/disco,mwilliams3/disco,mwilliams3/disco,simudream/disco,simudream/disco,ErikDubbelboer/disco,beni55/disco,mwilliams3/disco,pooya/disco,mozilla/disco,beni55/disco,beni55/disco,pombredanne/disco,mozilla/disco,beni55/disco,simudream/disco,ktkt2009/disco,mwilliams3/disco,pooya/disco,discoproject/disco,ErikDubbelboer/disco