backends/drm: Handle drmModeListLessees() failing

Vlad Zahorodniirequested to merge
work/cherry-pick-124c9cd6 into Plasma/6.3

SENTRY: KWIN-8BD

(cherry picked from commit 124c9cd6)

Co-authored-by: Vlad Zahorodnii vlad.zahorodnii@kde.org

Merge request reports