Comment # 9 on bug 107384 from Michel Dänzer

Thanks for the report, fixed in drm Git master:

commit 4519db23ef716f37f804485f50955c26c38a6ae6
Author: Mariusz Ceier <mceier+mesa-dev@gmail.com>
Date:   Sun Jul 29 10:20:14 2018 +0200

    xf86drm: Fix error path in drmGetDevice2