fix potential use after free in sources/config_reader.c

[chipitsine]

CID 642778: (#4 of 4): Use after free (USE_AFTER_FREE)
14. pass_freed_arg: Passing freed pointer lsc_current->name as an argument to od_config_reader_error.
1754                                od_config_reader_error(
1755                                        reader, &token,
1756                                        "lsc_password in ldap_storage_credentials '%s' cannot be empty",
1757                                        lsc_current->name);
1758                                goto error;
1759                        }