/usr/share/doc/libnsbmp0-dbg/changelog.Debian.gz is in libnsbmp0-dbg 0.0.1-1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libnsbmp0-dbg/../libnsbmp0/changelog.Debian.gz
/usr/share/doc/libnsbmp0-dbg/../libnsbmp0/changelog.Debian.gz