[PATCH] Change lt_dlerror to return NULL instaed of "unknown error"

[Scott James Remnant]

[ Patch resubmitted -- ping! :-) ]

This is the behaviour as described in the documentation.  Nothing I've
found relies on the different behaviour in the implementation so this
patch changes it to match the docs.

Scott
-- 
Have you ever, ever felt like this?
Had strange things happen?  Are you going round the twist?

keybuk-ltdlerror-return-value.patch
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