[offlineimap] fix status code to reflect success or failure to sync (#253)

[Nicolas Sebrecht]

We don't use GPG and I don't check GPG. Sorry if I was not clear.
I did a minor change in the patch. Also, there must be no merge in a submitted topic unless a maintainer asks for it. I fixed that.
Applied; thank you much.

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Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/pull/253#issuecomment-143958858
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