[cargo fuzz] TermRead

Created by: quininer

I try using the cargo-fuzz to fuzz termion::input::TermRead, found some problems. https://github.com/quininer/fuzz-termion-termread

called Option::unwrap() on a None value

payload (base64): qw== / 9Q== / qg==

### stack-buffer-overflow This should is false positive, see https://github.com/rust-lang/rust/issues/39882