https://bugs.freedesktop.org/show_bug.cgi?id=98914
--- Comment #9 from Christian König deathsimple@vodafone.de --- Yeah, the problem is on line 155 in that file.
Here "i" is used as signed and the calculation result can be negative.
Brave enough to create a patch for this or should I do that?
Thanks for the help and it's nice to know that this is still used.