1f409a0cbb81e2fb55281623c836e117e77b5e32
Generally we prefer 'return' from main() over exit() so that automatic cleanups and such work correct. Let's do that in shutdown.c too, becuase there's not really any reason not to. With this we are pretty good in consistently using return from main() rather than exit() all across the codebase. Yay!
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