clang-tidy: modernize-use-nullptr#7791

mattklein123 merged 1 commit intoenvoyproxy:masterenvoyproxy/envoy:masterfrom

derekargueta:dereka/clang-tidy-modernize-use-nullptrderekargueta/envoy:dereka/clang-tidy-modernize-use-nullptrCopy head branch name to clipboard