[collectd] patch to distinguish between malloc failure and duplicate key in avl_insert

[Luke Heberling]

I'd like to be able to tell when avl_insert fails because of a duplicate 
key as opposed to when it fails due to out of memory or other condition. 
What do you think?

Sorry for the barrage of trivial patches.  I've been working on this 
intermittently between tasks and did not have the foresight to spool 
them up.  It is not my intention that these patches need be looked at in 
any particular time frame.

I'll be moving the new powerdns, amavis and postfix plugins into full 
production tomorrow after which I'll soon be ready to try submitting 
them again.

Luke
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