some backends return invalid pointers

From: Oliver Rauch (oliver.rauch@Wolfsburg.DE)
Date: Sun Feb 20 2000 - 10:37:10 PST

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    Hi,

    some backends do return invalid pointers when sane_get_option_descriptor
    is called with a negative option (if only tests for <max_options and not for >=0).

    Although xsane will have no problems with that with the next version (0.57)
    it is not nice if the frontend gets an invalid pointer. xscanimage and xsane
    do use the option number -1 to define a not supported well known option.

    Please could every backend author make sure that only a valid pointer or NULL
    is returned.

    Bye
    Oliver 

    --
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