Queues close of registered file descriptor. Available since 5.15
pub fn close_direct(self: *IoUring, user_data: u64, file_index: u32) !*linux.io_uring_sqe
pub fn close_direct(self: *IoUring, user_data: u64, file_index: u32) !*linux.io_uring_sqe {
const sqe = try self.get_sqe();
sqe.prep_close_direct(file_index);
sqe.user_data = user_data;
return sqe;
}