fixed a bug that IGMPv3 report is not sometimes advertised on FreeBSD4 when an application stopped listening.
fixed a bug that IGMPv3 report is not sometimes advertised on FreeBSD4
when an application stopped listening.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame