[collectd] Read callback return value

[Florian Forster]

Hi Oleg,

returning non-zero triggers an exponential backoff, which is likely not the
best option for temporary failures such as timeouts.

https://github.com/collectd/collectd/blob/master/src/daemon/plugin.c#L542

Best regards,
—octo
-- 
Florian octo Forster
Hacker in training
GnuPG: 0x0C705A15
http://octo.it/
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