Fix missing file list variable defintions.

scripts/image_signing/common.sh

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Globals
 # ----------------------------------------------------------------------------
 
 # Determine script directory
 SCRIPT_DIR=$(dirname $0)
 PROG=$(basename $0)
 GPT=cgpt
 
 # The tag when the rootfs is changed.
 TAG_NEEDS_TO_BE_SIGNED="/root/.need_to_be_signed"
 
+# List of Temporary files and mount points.
+TEMP_FILE_LIST=$(mktemp)
+TEMP_DIR_LIST=$(mktemp)
+
 # Array of actions that are executed during the clean up process.
 declare -a cleanup_actions
 
 # Adds an action to be executed during the clean up process.
 # Actions are executed in the reverse order of when they were added.
 # ARGS: ACTION
 add_cleanup_action() {
   cleanup_actions[${#cleanup_actions[*]}]=$1
 }
 
@@ skipping 324 matching lines @@
 # Check if the 'chronos' user already has a password
 # Args: rootfs
 no_chronos_password() {
   local rootfs=$1
   sudo grep -q '^chronos:\*:' "$rootfs/etc/shadow"
 }
 
 trap "cleanup" INT TERM EXIT
 
 add_cleanup_action "cleanup_temps_and_mounts"