Replace a missing end-of-comment string

This happened when I went to fix long lines after running "make
autostyle".

src/lib/tls/tortls_openssl.c

@@ -673,7 +673,7 @@ tor_tls_context_new(crypto_pk_t *identity, unsigned int key_lifetime,
       SSL_CTX_set_tmp_ecdh(result->ctx, ec_key);
     EC_KEY_free(ec_key);
   }
-#endif /* defined(SSL_CTX_set1_groups_list) || ...)
+#endif /* defined(SSL_CTX_set1_groups_list) || ...) */
   SSL_CTX_set_verify(result->ctx, SSL_VERIFY_PEER,
                      always_accept_verify_cb);
   /* let us realloc bufs that we're writing from */