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backends/drm: fix multi gpu issues

Xaver Hugl requested to merge work/zamundaaa/correct-buffer-check into master

Commit 1: There can be situations where the surface fits but there's no test buffer yet

Commit 2: use linear buffers for multi gpu operation with CPU copy. Mesa may expose nonlinear buffers as having a different stride than the dumb buffers we copy into, and KWin doesn't support CPU copy if that happens

Edited by Xaver Hugl

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