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pixman-renderer: Check if the shm_buffer is gone during attach

Derek Foreman requested to merge derekf/weston:pixman-crash into main

Moving attach to the render loop in c08a6ff8 caused this to crash if the shm buffer is destroyed between being committed to a surface and being rendered.

Since we don't keep a reference to the buffer pool anyway, we might as well just skip the attachment here.

Fixes: #922 (closed)

Signed-off-by: Derek Foreman derek.foreman@collabora.com

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