/usr/share/doc/libghc-sdl-mixer-prof/changelog.Debian.gz is in libghc-sdl-mixer-prof 0.6.1-9.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libghc-sdl-mixer-prof/../libghc-sdl-mixer-dev/changelog.Debian.gz