修正收包后创建的msg_group中elements指针没有被清空的BUG
修正收包后创建的msg_group中elements指针没有被清空的BUG

jack230230/qtun,hermixy/qtun,hermixy/qtun,jack230230/qtun,jack230230/qtun,jack230230/qtun,hermixy/qtun,hermixy/qtun,hermixy/qtun,jack230230/qtun,jack230230/qtun,hermixy/qtun,hermixy/qtun,jack230230/qtun