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:Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> Signed-off-by:
Anton Khirnov <anton@khirnov.net>
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