purge: prevent a silly crash with --confirm --files if --files is passed, there was no directory to checks and `msg` was undefined. This is now fixed and tested.

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fn main() {

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    cc::Build::new()

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        .warnings(true)

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        .file("src/sendfds.c")

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        .file("src/sighandlers.c")

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        .compile("procutil");

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}