findmissing: fix lint errors

GERRIT="${WORKSPACE}/chromite/bin/gerrit"
^----^ SC2034 (warning): GERRIT appears unused. [...]

BUG=b:304262148
TEST=cros lint scripts/gce/gce-startup.sh

Change-Id: I48a66b9763c51bd9b6dadf27d08a2e50fee4f683
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/5219516
Tested-by: Tzung-Bi Shih <tzungbi@chromium.org>
Commit-Queue: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
diff --git a/contrib/findmissing/scripts/gce/gce-startup.sh b/contrib/findmissing/scripts/gce/gce-startup.sh
index c51a67b..1682106 100755
--- a/contrib/findmissing/scripts/gce/gce-startup.sh
+++ b/contrib/findmissing/scripts/gce/gce-startup.sh
@@ -13,7 +13,6 @@
 HOME="/home/${USER}"
 WORKSPACE="${HOME}/findmissing_workspace"
 FINDMISSING="${WORKSPACE}/dev-util/contrib/findmissing"
-GERRIT="${WORKSPACE}/chromite/bin/gerrit"
 DATABASE=us-central1:linux-patches-mysql-8
 
 if [[ -e /etc/systemd/system/cloud-sql-proxy.service ]]; then