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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Add an explicit "you're holding it wrong" error code.
 - Consistently return error codes and not have some special places
   where -1 is returned.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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That is IMO less confusing and express what it is (i.e. what it has
become) more clearly, i.e. common code shared by the utilities.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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