[An extra null pointer check is not needed](https://isocpp.org/wiki/faq/freestore-mgmt#delete-handles-null "Do I need to check for null before delete p?") like in [the function “DeallocatingVector::clear”](https://github.com/Project-OSRM/osrm-backend/blob/82b5648c97edf1d2edec7aecebc35aa8a8033c82/include/util/deallocating_vector.hpp#L234 "Update candidate").
