[FFmpeg-devel] Fix mjpeg decoder runaway from internal buffer

[Anatoliy Nenashev]

Hi!
In some cases there is a situation when mjpeg decoder runaway from 
allocated s->buffer.
Usually it happens in VLC decoder for DC-AC coefficients when input 
frame is cirrupted.
In this case it is caused by "specific" garbage at the end of the memory 
allocated for s->buffer.

Here is a fix to prevent this situation.

Anatoly.
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