avcodec/vp3: Add missing check for av_malloc
Since the av_malloc() may fail and return NULL pointer, it is needed that the 's->edge_emu_buffer' should be checked whether the new allocation is success. Fixes: d1472386 ("VP3: fix decoding of videos with stride > 2048") Reviewed-by: Peter Ross <pross@xvid.org> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
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