avcodec/tiff: Check for planar DNG images
The DNG code hardcodes plane 0 at some places, so its better to disallow cases that have more planes. Fixes: eg_crash Found-by: 黄宁 <tsukimurarin@163.com> Reviewed-by: Nick Renieris <velocityra@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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