/usr/share/doc/libdirectfb-1.2-9-dbg/changelog.Debian.gz is in libdirectfb-1.2-9-dbg 1.2.10.0-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdirectfb-1.2-9-dbg/../libdirectfb-1.2-9/changelog.Debian.gz