Andreas Cadhalpun c089e720c1 webp: ensure that each transform is only used once ...

According to the WebP Lossless Bitstream Specification
"each transform is allowed to be used only once".

If a transform is more than once this can lead to memory
corruption.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

2015-03-06 03:45:42 +01:00

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