wet_main->parse_options-> .... ->strdup ->malloc 

"config_file" memory is not released 

"log" memory is not released

When agl-compositor startup parameters contain socket and modules, the memory of socket_name and option_modules also needs to be released.

So I implemented a function to release  backend, socket_name, log, config_file, option_modules, these  five pointers.

To prevent the backend from being released again, I deleted the following two lines of code.

• free(backend);
• backend = NULL;