`EnumValues` iterator doesn't correctly handle values whose name is invalid UTF-8

[yotamofek]

winreg-rs/src/reg_key.rs

Line 979 in 850d852

let name = match String::from_utf16(&name[..name_len as usize]) {

I think that EnumValues should impl Iterator<Item = Result<(OsString, RegValue)>> instead of using Strings for the value names.