Remove more error handling linting

Author: keithduncan

packer/linux/conf/docker/cron.hourly/docker-low-disk-gc

@@ -14,8 +14,11 @@ mark_instance_unhealthy() {
   # mark the instance for termination
   echo "Marking instance as unhealthy"
 
+  # shellcheck disable=SC2155
   local token=$(curl -X PUT -H "X-aws-ec2-metadata-token-ttl-seconds: 60" --fail --silent --show-error --location "http://169.254.169.254/latest/api/token")
+  # shellcheck disable=SC2155
   local instance_id=$(curl -H "X-aws-ec2-metadata-token: $token" --fail --silent --show-error --location "http://169.254.169.254/latest/meta-data/instance-id")
+  # shellcheck disable=SC2155
   local region=$(curl -H "X-aws-ec2-metadata-token: $token" --fail --silent --show-error --location "http://169.254.169.254/latest/meta-data/placement/region")
 
   aws autoscaling set-instance-health \