/usr/share/doc/libdmapsharing-3.0-dev/changelog.Debian.gz is in libdmapsharing-3.0-dev 2.9.39-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdmapsharing-3.0-dev/../libdmapsharing-3.0-2/changelog.Debian.gz