elliptic-curve: make NonZeroScalar::invert infallible
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Because `NonZeroScalar` means we'll never divide by 0, it's possible to make the implementation infallible. To accomplish this, `CtOption` is removed from the `Invert` trait's signature, and used as the result type for scalars that are potentially zero as part of the blanket impl of `Invert`. Fixes RustCrypto/elliptic-curves#499
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Because
NonZeroScalarmeans we'll never divide by 0, it's possible to make the implementation infallible.To accomplish this,
CtOptionis removed from theInverttrait's signature, and used as the result type for scalars that are potentially zero as part of the blanket impl ofInvert.Fixes RustCrypto/elliptic-curves#499