[Bug 3289] Patch fixing the issues found by coverity scan

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3289

--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
I've been through the PR and I think we've gotten most of it, could you
please rebase and let us know if we've missed anything?

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