Make no-psk compile without warnings.

PR#4035
Reviewed-by: NMatt Caswell <matt@openssl.org>

apps/s_server.c

@@ -1316,10 +1316,6 @@ int s_server_main(int argc, char *argv[])
                 goto end;
             }
             break;
-#else
-        case OPT_PSK_HINT:
-        case OPT_PSK:
-            break;
 #endif
 #ifndef OPENSSL_NO_SRP
         case OPT_SRPVFILE:

ssl/s3_lib.c

@@ -5228,8 +5228,9 @@ int ssl_generate_master_secret(SSL *s, unsigned char *pms, size_t pmslen,
             s->method->ssl3_enc->generate_master_secret(s,
                                                         s->session->master_key,
                                                         pms, pmslen);
-
+#ifndef OPENSSL_NO_PSK
     err:
+#endif
     if (pms) {
         if (free_pms)
             OPENSSL_clear_free(pms, pmslen);

ssl/ssl_cert.c

@@ -333,13 +333,13 @@ CERT *ssl_cert_dup(CERT *cert)
         goto err;
     if (!custom_exts_copy(&ret->srv_ext, &cert->srv_ext))
         goto err;
-
+#ifndef OPENSSL_NO_PSK
     if (cert->psk_identity_hint) {
         ret->psk_identity_hint = BUF_strdup(cert->psk_identity_hint);
         if (ret->psk_identity_hint == NULL)
             goto err;
     }
-
+#endif
     return (ret);
 
  err: