/usr/share/doc/libsdl-net1.2-dev/changelog.Debian.gz is in libsdl-net1.2-dev 1.2.8-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsdl-net1.2-dev/../libsdl-net1.2/changelog.Debian.gz