[PATCH] libtacplus bugfix

[Attilio Rao]

[Please CC me as I'm not subscribed to -net@]

In tac_get_av_value() empty attributes should be handled like 0-lenght
strings while in the current code they are handled as unset
attributes.
This patch implements the (probabilly) desired semantic:
http://www.freebsd.org/~attilio/Sandvine/STABLE_8/libtacplus/taclib.diff

This patch has been contributed back by Sandvine Incorporated.
Comments, reviews and testing are welcome.

Thanks,
Attilio


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