framebuffer-blit-levels: fix off-by-one error.
Previously, the test made the erroneous assumption that if the size of a texture is 2^n, then that texture has n miplevels. This was wrong--the texture has n+1 miplevels, ranging in size from 2^n to 2^0. Reviewed-by: Eric Anholt <firstname.lastname@example.org> Reviewed-by: Anuj Phogat <email@example.com>
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