[collectd] plugin_register_complex_read() and user_data free() on errors

[Pavel V.]

Hi.

While I'm working on my plugins, I noted some minor inconsistences in the sources and docs.
I have updated wiki (minor changes in docs), and I like to propose some source code fixes now.

The problem, which patch covers, is not serious, but I think it needs to be fixed anyway.
1) It is the lack of freeing memory when encountering errors at early stages (plugin_register_complex_read() /  create_register_callback().
2) It can be double free() when encountering errors  (at later stages) in plugin_register_complex_read()  call in some plugins.

See the patch attached.

-- 
Thanks,
Pavel.
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