k5_cc_mutex_init
k5_cc_mutex_init(k5_cc_mutex *m);
ret = k5_cc_mutex_init(&data->lock);
ret = k5_cc_mutex_init(&data->lock);
if (k5_cc_mutex_init(&data->lock) != 0)
ret = k5_cc_mutex_init(&data->lock);
err = k5_cc_mutex_init(&d->lock);