Comment # 2 on bug 1209866 from Johannes Meixner

Antonio Larrosa,
thank you for your analysis and your clear descriprtion
what the cause is and for your patch and your proper
OBS submitrequest to get it fixed!

HPLIP upstream is at
https://developers.hp.com/hp-linux-imaging-and-printing
(see the 'URL' in the hplip.spec file).
As far as I know there is no public accessible
source code repository for HPLIP.
As far as I know the only way is via
"Contact Us: Report a Bug" at
https://developers.hp.com/hp-linux-imaging-and-printing/about
which leads to Ubuntu's "Launchpad log in with Ubuntu One"
so you need a Ubuntu One account.