fix panic on PRC_GETOPT.  need more improvement (userland gets optlen = 0??)
fix panic on PRC_GETOPT.  need more improvement (userland gets optlen = 0??)

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