Remove unneccessary checks
Remove unneccessary checks

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