mariadb_config --unknown-option exits with code 0

When you run mariadb_config from mariadb-connector-c with an unknown option, it exits with code 0. One supposes that the return code should be 1 (the same code that mysql_config returns with the unknown option).

# mariadb_config --unknown-option 

mariadb_config: unrecognized option '--unknown-option'

# echo $?

0