jc_utils: fix the broken stage_info_opt function.
jc_utils: fix the broken stage_info_opt function.

This function should return a stage if the stage is found.  However, it was
reusing a bounded argument of a different type.

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