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/lib/ssl/ssl3ecc.c

@@ -548,12 +548,14 @@ ssl3_HandleECDHServerKeyExchange(sslSocket *ss, PRUint8 *b, PRUint32 length)
     if (ss->ssl3.prSpec->version == SSL_LIBRARY_VERSION_TLS_1_2) {
         rv = ssl_ConsumeSignatureScheme(ss, &b, &length, &sigScheme);
         if (rv != SECSuccess) {
-            goto loser; /* malformed or unsupported. */
+            errCode = PORT_GetError();
+            goto alert_loser; /* malformed or unsupported. */
         }
         rv = ssl_CheckSignatureSchemeConsistency(ss, sigScheme,
                                                  ss->sec.peerCert);
         if (rv != SECSuccess) {
-            goto loser;
+            errCode = PORT_GetError();
+            goto alert_loser;
         }
         hashAlg = ssl_SignatureSchemeToHashType(sigScheme);
     } else {