/usr/share/doc/libcmocka-dev/html is in cmocka-doc 1.0.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcmocka-dev/../cmocka-doc/html
/usr/share/doc/libcmocka-dev/../cmocka-doc/html