Identity transforms do not protect against range overflows

See !870 (closed) for more details.

$ aomdec /tmp/tennis.ivf -o /tmp/tennis.aom.yuv --rawvideo
$ tools/dav1d -i /tmp/tennis.ivf -o /tmp/tennis.dav1d.yuv --quiet --cpumask=0
$ diff -q /tmp/tennis.{aom,dav1d}.yuv
Files /tmp/tennis.aom.yuv and /tmp/tennis.dav1d.yuv differ

Edited Dec 28, 2019 by Ronald S. Bultje

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