struct pbt_client *pbt_client_init(enum pbt_twin_backend backend,
unsigned int width, unsigned int height,
int (*kexec_cb)(struct pbt_client *, struct pb_opt_data *),
struct pbt_client *pbt_client_init(enum pbt_twin_backend backend,
unsigned int width, unsigned int height,
int (*kexec_cb)(struct pbt_client *, struct pb_opt_data *),