update socket_server.c, fix Address already in use bug, setsockopt must p...

Guo Wenxue

2018-10-24 357fe7ceed7c2cf00cbe1b26e19cd2b9fde51aab

 apue/1.File_IO/ds18b20.c

@@ -76,6 +76,7 @@
            /* find and get the chipset SN filename */
            strcpy(chip,direntp->d_name);
            found = 1;
       break;
        }
    }
    closedir(dirp);