Update NSS to 3.38

- Added HACL*Poly1305 32-bit (INRIA/Microsoft)
- Updated to final TLS 1.3 draft version (28)
- Removed TLS 1.3 prerelease draft limit check
- Removed NPN code
- Enabled dev/urandom-only RNG on Linux with NSS_SEED_ONLY_DEV_URANDOM for non-standard environments
- Fixed several bugs with TLS 1.3 negotiation
- Updated internal certificate store
- Added support for the TLS Record Size Limit Extension.
- Fixed CVE-2018-0495
- Various security fixes in the ASN.1 code.

security/nss/nss-tool/enc/enctool.cc

@@ -271,7 +271,6 @@ bool EncTool::DoCipher(std::string file_name, std::string out_file,
   if (file_name.empty()) {
     std::vector<uint8_t> data = ReadInputData("");
     std::vector<uint8_t> out(data.size() + 16);
-    SECStatus rv;
     if (encrypt) {
       rv = PK11_Encrypt(symKey.get(), cipher_mech_, params.get(), out.data(),
                         &outLen, data.size() + 16, data.data(), data.size());