Build warnings on Linux (strict-overflow in sc + unused variable in vcl)

[julien2412]

With the patch already quoted applied locally + "(void) sWindow;" for vcl
parl, I kept on the build.

Now I've got something a bit weird (this time in sw module) ::
/home/julien/lo/libreoffice/sw/source/core/text/txtfrm.cxx: In member
function ‘virtual bool SwTextFrame::Prepare(PrepareHint, const void*,
bool)’:
/home/julien/lo/libreoffice/sw/source/core/text/txtfrm.cxx:1447:6: error:
assuming signed overflow does not occur when assuming that (X + c) < X is
always false [-Werror=strict-overflow]
 bool SwTextFrame::Prepare( const PrepareHint ePrep, const void* pVoid,
          ^
How a function may trigger this?




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