[Libreoffice] [PATH] prefer prefix ++/-- operators

[Kayo Hamid]

 Continuing the journey of cleaning cppcheck.

 ps: 
 http://lists.freedesktop.org/archives/libreoffice/2011-April/010562.html 
 <- I sent this path Friday, and how is common the community stop on 
 weekend, I put this link so it does not end up losing

 revol_
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