remove invalid check if not intercepting the first syn
remove invalid check if not intercepting the first syn

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