Signed/unsigned comparisons part 1

[Vincent Béron]

While compiling the tests in MSDev, I came across some signed/unsigned
comparisons. They are not detected with the default CFLAGS in the Unix
makefiles (to do that, we need either -Wsign-compare, or -W which
enables even more warnings).

This patch is the first part; the rest will go to tomorrow.

Changelog:
Fix signed/unsigned comparison.

Vincent
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