[xmlsec] Patches for issues found by automated check tools

[Simo Sorce]

Hello,
we've run a bunch of checkers against the latest xmlsec code and I have
a few patches you may want to consider for inclusion.

Some are no brainers, others you may like or not.
I would like to apply them downstream once they are accepted in master,
let me know what you think.

Simo.

-- 
Simo Sorce * Red Hat, Inc * New York
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