/usr/share/doc/libfdt-dev/changelog.Debian.gz is in libfdt-dev 1.3.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libfdt-dev/../libfdt1/changelog.Debian.gz
/usr/share/doc/libfdt-dev/../libfdt1/changelog.Debian.gz