bugfix: memory leak in decode
bugfix: memory leak in decode

MonCoder/pbc,cloudwu/pbc,boyuegame/pbc,owent-contrib/pbc,xiaoqunSun/pbc,CheyiLin/pbc,zh423328/pbc,owent-contrib/pbc,DoooReyn/pbc,cloudwu/pbc,zhuoyikang/pbc,yubobarye/pbc