Fix duplicate sever-port bug

bin/cros_copy_upgrade_server.sh

 #!/bin/sh
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Flags
 DEFINE_string upgrade_server "" "SSH-capable host for upgrade server install"
 DEFINE_string dest_path "" "Directory on host to do install"
 DEFINE_string client_address "" "IP Address of netbook to update"
@@ skipping 100 matching lines @@
 start_server () {
   require_upgrade_server
   echo "Starting remote devserver..."
   server_logfile=/tmp/devserver_log.$$
   portlist=/tmp/devserver_portlist.$$
   echo "Server will be logging locally to $server_logfile"
 
   # Find a TCP listen socket that is not in use
   ssh ${FLAGS_upgrade_server} "netstat -lnt" | awk '{ print $4 }' > $portlist
   server_port=8081
-  while grep -q ":${port}$" $portlist; do
+  while grep -q ":${server_port}$" $portlist; do
     server_port=$[server_port + 1]
   done
   rm -f $portlist
 
   ssh ${FLAGS_upgrade_server} "cd ${FLAGS_dest_path}/src/scripts && env PYTHONPATH=${remote_root}${FLAGS_dest_path}/python CHROMEOS_BUILD_ROOT=${archive_dir} ./start_devserver --archive_dir ${archive_dir} $server_port" > $server_logfile 2>&1 &
   server_pid=$!
 
   trap server_cleanup 2
 
   # Wait for server to startup
@@ skipping 54 matching lines @@
     fi
     live_args="--update_url=http://${FLAGS_server_address}:${server_port}/update \
         --remote=${FLAGS_client_address}"
    echo "Running ${SCRIPTS_DIR}/image_to_live.sh $live_args"
     ${SCRIPTS_DIR}/image_to_live.sh $live_args &
   fi
 
   wait ${server_pid}
 fi