scripts: remove unused variables

Remove unused variables from mod_image_for_recovery.sh. No functional
change.

BUG=none
TEST=mod_image_for_recovery.sh still works

Change-Id: Idfceba65b82d54eff6f2931e4c057350c9a3a22e
Reviewed-on: https://chromium-review.googlesource.com/1705919
Tested-by: Thiemo Nagel <tnagel@chromium.org>
Commit-Ready: Thiemo Nagel <tnagel@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed