create_new_android_keys: fix typo.

BUG=None
TEST=manually verified.
BRANCH=None

Change-Id: I65467d56409bcf608e9c59aa0759e820d11507ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1667537
Tested-by: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
diff --git a/scripts/keygeneration/create_new_android_keys.sh b/scripts/keygeneration/create_new_android_keys.sh
index 5e865c8..ce8253d 100755
--- a/scripts/keygeneration/create_new_android_keys.sh
+++ b/scripts/keygeneration/create_new_android_keys.sh
@@ -62,7 +62,7 @@
       ;;
     --rotate-from)
       old_dir="$2"
-      shift
+      shift 2
       ;;
     -*)
       usage "Unknown option: $1"