Update storage/memoized_iterator.go
Update storage/memoized_iterator.go

Signed-off-by: Marco Pracucci <marco@pracucci.com>

Co-authored-by: Julien Pivotto <df1ed88a312a603dfee9f157a90fa8f7f195ab59@gmail.com>
alileza/prometheus,alileza/prometheus,prometheus/prometheus,prometheus/prometheus,prometheus/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus