/usr/share/doc/libnfft3-dev/changelog.Debian.gz is in libnfft3-dev 3.3.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libnfft3-dev/../libnfft3-double2/changelog.Debian.gz
/usr/share/doc/libnfft3-dev/../libnfft3-double2/changelog.Debian.gz