Still check UTF validity in dnsname

            let len = ffi::ASN1_STRING_length((*self.name).d as *mut _);

            let slice = slice::from_raw_parts(ptr as *const u8, len as usize);

            Some(str::from_utf8_unchecked(slice))

            // dNSNames are stated to be ASCII (specifically IA5). Hopefully

            // OpenSSL checks that when loading a certificate but if not we'll

            // use this instead of from_utf8_unchecked just in case.

            str::from_utf8(slice).ok()

        }

    }