calc.c: Removed an unused variable in calc_item()
calc.c: Removed an unused variable in calc_item()

piyo/ncdu,rofl0r/ncdu,ppetr/ncdu,rofl0r/ncdu,guns/ncdu,FauxFaux/ncdu,FauxFaux/ncdu,sunny256/ncdu,ppetr/ncdu,sunny256/ncdu,ppetr/ncdu,guns/ncdu,gitkaste/ncdu,guns/ncdu,gitkaste/ncdu