[release-branch.go1.13] crypto/cipher: require non-zero nonce size for AES-GCM
    
    Also fix typo in crypto/cipher/gcm_test.go.
    
    Updates #37118
    Fixes #37417
    
    Change-Id: I8544d1eeeb1f0336cebb977b8c5bfa5e4c5ad8c7
    Reviewed-on: https://go-review.googlesource.com/c/go/+/218500
    Run-TryBot: Katie Hockman <katie@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: Filippo Valsorda <filippo@golang.org>
    (cherry picked from commit 4e8badbbc2fe7854bb1c12a9ee42315b4d535051)
    Reviewed-on: https://go-review.googlesource.com/c/go/+/220653
    Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>