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backends/drm: don't wait for pageflips on DrmPipeline destruction

Xaver Hugl requested to merge work/zamundaaa/egpu-unplug-timeout into master

There's only two cases where a pipeline can be destroyed:

  • hotunplug of a display, in which case DrmGpu already waits for all pipelines to be idle
  • hotunplug of a GPU, in which case the pageflip events are safely ignored

In the latter case, it can happen that a pending pageflip event will never arrive, so it's not just unnecessary but actively harmful to wait for the pageflip event.

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