/usr/share/doc/libsscm-dev/changelog.Debian.gz is in libsscm-dev 0.8.5-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsscm-dev/../libgcroots0/changelog.Debian.gz
/usr/share/doc/libsscm-dev/../libgcroots0/changelog.Debian.gz