/usr/share/doc/libsdl-image1.2-dbg/changelog.Debian.gz is in libsdl-image1.2-dbg 1.2.12-5build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsdl-image1.2-dbg/../libsdl-image1.2/changelog.Debian.gz