Merge commit '61c966ef30129a0e4dba485242c039a895914d33' into release/2.2
* commit '61c966ef30129a0e4dba485242c039a895914d33':
webp: validate the distance prefix code
See: c089e720c1
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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