io_uring_prep_splice(): fix type (again)

Guillem Jover correctly points out that this did used to be loff_t,
but was changed since it wasn't available everywhere.

Let's just use an int64_t, it's the same size and signed. Hopefully
this is it...

Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed