Update socket.lua (#1197)
Update socket.lua (#1197)

如果监听套接字在accept时异常（例如：errno == EMFILE），那么不应该关闭监听套接字本身，输出异常信息即可。
korialuo/skynet,sanikoyes/skynet,korialuo/skynet,xjdrew/skynet,wangyi0226/skynet,wangyi0226/skynet,xcjmine/skynet,pigparadise/skynet,cloudwu/skynet,ag6ag/skynet,pigparadise/skynet,JiessieDawn/skynet,xjdrew/skynet,xcjmine/skynet,bigrpg/skynet,sanikoyes/skynet,korialuo/skynet,ag6ag/skynet,hongling0/skynet,ag6ag/skynet,hongling0/skynet,icetoggle/skynet,cloudwu/skynet,bigrpg/skynet,sanikoyes/skynet,icetoggle/skynet,JiessieDawn/skynet,cloudwu/skynet,icetoggle/skynet,bigrpg/skynet,hongling0/skynet,pigparadise/skynet,xcjmine/skynet,JiessieDawn/skynet,wangyi0226/skynet,xjdrew/skynet