Apply code review feedback and fix an incorrect statement
Apply code review feedback and fix an incorrect statement

Only rustup needs to be updated.

rust-lang/rustup,nodakai/rustup.rs,nodakai/rustup.rs,nodakai/rustup.rs,nodakai/rustup.rs,nodakai/rustup.rs,rust-lang/rustup,rust-lang/rustup,rust-lang/rustup,rust-lang/rustup