/usr/share/doc/libibnetdisc5/changelog.Debian.gz is in libibnetdisc5 2.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libibnetdisc5/../libibmad5/changelog.Debian.gz
/usr/share/doc/libibnetdisc5/../libibmad5/changelog.Debian.gz