backends/drm: don't update outputs from within DrmGpu
DrmBackend::updateOutputs may delete DrmGpu objects, so calling it from within a DrmGpu method can cause problems
BUG: 483008 FIXED-IN: 6.1.0
DrmBackend::updateOutputs may delete DrmGpu objects, so calling it from within a DrmGpu method can cause problems
BUG: 483008 FIXED-IN: 6.1.0