Why is getentropy marked with warn_unused_result?

[Florian Bruhin <me at the-compiler dot org>]

Hi!

I recently opened a bug in the Qt project[1] because it failed to
compile on my system. The reason this happened is because it ignored the
return value of a getentropy() call, and that's marked with __wur.

Why is that, since it shouldn't fail under normal circumstances (at
least that's what Qt's sources claim)?

Florian

[1] https://bugreports.qt.io/browse/QTBUG-61968

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