* Move setjmp invocation back into decoding function.
Behavior is undefined if longjmp is called after the function containing
setjmp invocation has terminated.
* Revert "Add error checking on jpeg utils (#563)"
This is dead code because longjmp invocation ensures control is returned
to the existing error path.
This reverts commit caea41df75.
* Silence spurious gcc 4.8.4 warning.
The previous version of jpegutils.c was performing the downsampling of images manually
This commit rewrites the decompression to take advantage of the built in downsampling
and image color space conversion that is part of the JPEG libaries.
This function is currently only called from the vid_mjpegtoyuv420p routine.
