bugfix: adjust packed varint length
bugfix: adjust packed varint length

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