intcmp(1), swab(1): consistent type annotations

src/intcmp.rs

@@ -39,7 +39,7 @@ fn err(argv0: &String, e: String, code: u8) -> ExitCode {
 	ExitCode::from(code)
 }
 
-fn usage(argv0: &str) -> ExitCode {
+fn usage(argv0: &String) -> ExitCode {
 	eprintln!("Usage: {} [-egl] integer integer...", argv0);
 	ExitCode::from(EX_USAGE)
 }