src/tools/procfs.rs: avoid useless allocations
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@ -386,7 +386,7 @@ pub fn read_proc_net_ipv6_route() -> Result<Vec<ProcFsNetIPv6Route>, Error> {
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let mut iter = content.split_whitespace();
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let mut next = || iter.next()
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.ok_or(format_err!("Error while parsing '{}'", path));
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.ok_or_else(|| format_err!("Error while parsing '{}'", path));
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let (dest, prefix) = (next()?, next()?);
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for _ in 0..2 { next()?; }
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