fix a logic error in examine the value of 'percentage'.
fix a logic error in examine the value of 'percentage'.

caosiyang/tcpcopy,caosiyang/tcpcopy,wfxiang08/tcpcopy,ycaihua/tcpcopy,daodaoliang/tcpcopy,u20024804/tcpcopy,sshling/tcpcopy,horryq/tcpcopy,u20024804/tcpcopy,liviusATnetskope/second,daodaoliang/tcpcopy,ycaihua/tcpcopy,eliteYang/tcpcopy,sshling/tcpcopy,left2right/tcpcopy,wfxiang08/tcpcopy,liviusATnetskope/second,left2right/tcpcopy,eliteYang/tcpcopy,horryq/tcpcopy