No package data is returned for package that has colon in its name

There is no license/copyright data return for the following debian packages
```
git_1:2.20.1-2+deb10u2_amd64.deb
git-man_1:2.20.1-2+deb10u2_all.deb
libguestfs0_1:1.40.2-2_amd64.deb
libguestfs-hfsplus_1:1.40.2-2_amd64.deb
libguestfs-reiserfs_1:1.40.2-2_amd64.deb
libguestfs-xfs_1:1.40.2-2_amd64.deb
libio-pty-perl_1:1.08-1.1+b5_amd64.deb
```
The issue is likely becuase of the `:` in its name that cause issue when parsing the debain filename.