Andreas Cadhalpun 30e6abd1a8 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>

2015-03-19 21:03:13 +01:00

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