FFmpeg/libavcodec
Michael Niedermayer 12eb2fd539 dxa: dont try to use the previous frame if there is none.
Fixes null pointer dereference.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-11-15 00:43:30 +01:00
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