Apply clippy’s advices
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		@@ -121,7 +121,7 @@ impl Updater {
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            .collect();
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        // TODO:
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        if errors.len() == 0 {
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        if errors.is_empty() {
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            Ok(())
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        } else {
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            Err(Error::new(
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@@ -158,7 +158,7 @@ impl Updater {
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impl System {
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    pub fn fetch(&self, opt: &Opt) -> Result<()> {
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        if let Some(fetch) = &self.fetch {
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            fetch.clone().prepare(opt).execute(&opt)?;
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            fetch.clone().prepare(opt).execute(opt)?;
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        }
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        Ok(())
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    }
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