/usr/share/doc/libghc-diagrams-lib-prof/changelog.Debian.gz is in libghc-diagrams-lib-prof 1.3.0.8-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libghc-diagrams-lib-prof/../libghc-diagrams-lib-dev/changelog.Debian.gz