pki_crypto: Always copy ecdsa_nid into duplicated ECDSA keys

BUG: https://red.libssh.org/issues/147

Signed-off-by: Alan Dunn <amdunn@gmail.com>

src/pki_crypto.c

@@ -345,13 +345,13 @@ ssh_key pki_key_dup(const ssh_key key, int demote)
         break;
     case SSH_KEYTYPE_ECDSA:
 #ifdef HAVE_OPENSSL_ECC
+        new->ecdsa_nid = key->ecdsa_nid;
+
         /* privkey -> pubkey */
         if (demote && ssh_key_is_private(key)) {
             const EC_POINT *p;
             int ok;
 
-            new->ecdsa_nid = key->ecdsa_nid;
-
             new->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid);
             if (new->ecdsa == NULL) {
                 goto fail;