[PATCH 1/6] drm/vc4: Make vc4_lbm_size() return 0 when vertical scaling is disabled

[Eric Anholt]

Boris Brezillon <boris.brezillon at bootlin.com> writes:

> LBM is not needed when vertical scaling is disabled. Return 0 in this
> case to avoid allocating LBM memory that will anyway be unused.
>
> While at it, drop the test on ->is_unity which is now redundant.

r-b
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