[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?") in [the function “lc_i_free_interactive_controller”](https://github.com/meshula/LabCamera/blob/5e6f0cf53558a3eb99972c48be628c9da4a24777/cpp/LabCamera.cpp#L701 "Update candidate").
