review and possibly apply patches from debian package
There's a number of patches in the Debian package whcih might be useful to apply to mainline.
I'm particularly thinking of the following patches:
hurd-usb improve-librtlsdr-pc-file improve-scanning-range-parsing ipv6-support use-udev-uaccess-rules
which can be found at https://salsa.debian.org/bottoms/pkg-rtl-sdr/tree/debian/debian/patches