[PATCH] CTDB event script error (and unusual) path fixes (bug 12180)

[Martin Schwenke]

There is some bad callback and talloc_steal() logic in the CTDB daemon's
event script code that can uninitialised pointers to be dereferenced.
The attached patches fix the issues and add a test for one obvious case.

Please review and maybe push...

peace & happiness,
martin
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