vdo_duplicate_string
result = vdo_duplicate_string(dm_shift_arg(&arg_set), "parent device name",
result = vdo_duplicate_string(name, "queue name", &queue->common.name);
result = vdo_duplicate_string(name, "queue name", &queue->common.name);
int __must_check vdo_duplicate_string(const char *string, const char *what,