/usr/share/doc/gir1.2-gusb-1.0/changelog.Debian.gz is in gir1.2-gusb-1.0 0.1.6-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-gusb-1.0/../libgusb2/changelog.Debian.gz
/usr/share/doc/gir1.2-gusb-1.0/../libgusb2/changelog.Debian.gz