/usr/share/doc/libgfs-dev/changelog.Debian.gz is in libgfs-dev 20131206+dfsg-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgfs-dev/../libgfs-1.3-2/changelog.Debian.gz
/usr/share/doc/libgfs-dev/../libgfs-1.3-2/changelog.Debian.gz