/usr/share/doc/cpl-plugin-visir-calib/changelog.Debian.gz is in cpl-plugin-visir-calib 4.1.0+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/cpl-plugin-visir-calib/../cpl-plugin-visir/changelog.Debian.gz