/usr/share/doc/libtsm-dev/changelog.Debian.gz is in libtsm-dev 3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtsm-dev/../libtsm3/changelog.Debian.gz
/usr/share/doc/libtsm-dev/../libtsm3/changelog.Debian.gz