reported_length < -1

[Martin Kaiser <lists () kaiser cx>]

Dear all,

I stumbled on

tvb_new_subset(tvb, 10, (tvb_get_guint8(tvb, 1) - 2), (tvb_get_guint8(tvb, 1) - 2)); 

If tvb_get_guint8(tvb, 1)==0, we throw an exception because of
backing_length - that makes sense.

As for reported_length<-1, it looks like that's ok when the tvb is
created. There'll be an exception when it's accessed, we'll always be
out of bounds.

Is there a valid use case for reported_length<-1?

Thanks,
Martin
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