fix sock invalid problem
fix sock invalid problem

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