coverity: NULL dereference

Fixes coverity 1544699.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from #22138)

crypto/engine/eng_table.c

@@ -97,6 +97,7 @@ int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
     if (added && !engine_cleanup_add_first(cleanup)) {
         lh_ENGINE_PILE_free(&(*table)->piles);
         *table = NULL;
+        goto end;
     }
     while (num_nids--) {
         tmplate.nid = *nids;