swab(1): don't use the getopt error message
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@ -50,7 +50,7 @@ fn main() -> ExitCode {
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let mut wordsize: usize = 2;
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while let Some(opt) = argv.getopt("w:") {
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while let Some(opt) = argv.getopt(":w:") {
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match opt.opt() {
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Ok("w") => {
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if let Some(arg) = opt.arg() {
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