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freedreno: fix eglDupNativeFenceFD error

Rob Clark requested to merge robclark/mesa:wip/fence-fd-fix into master

We can end up with scenarios where last_fence is associated with a batch that is flushed through some other path before needs_out_fence_fd gets set. Resulting in returning a fence that has no backing fd.

The simplest thing is to just skip the optimization to try and avoid no-op batches when a fence-fd is requested. This should normally be just once a frame anyways.

Signed-off-by: Rob Clark robdclark@chromium.org

NOTE: unfortunately it isn't a thing I can apitrace (that I know of), so I'm not entirely sure how to identify the exact sequence of gl calls that triggers this. But the fix seems reasonable to me.

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