avcodec/jpeg2000: Simplify exp2fi for numbers used here
The call to ff_exp2fi() here always uses arguments in the normal range, so that the branches in ff_exp2fi() are unnecessary. This is so because JPEG2000 itself only supports up to 128 bits per component per pixel (we only support far less); furthermore, expn is always 0..31 for the decoder and also sane for the encoder, so that the difference between these two values is always in the normal range of -126..128. Reviewed-by: Tomas Härdin <git@haerdin.se> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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