libublk: io: don't pass user_data to ublk_submit_sqe_sync()

For ublk_submit_sqe_sync(), the data is built from its caller, so
no need to pass it in.

Signed-off-by: Ming Lei <[email protected]>

examples/loop.rs

@@ -195,8 +195,8 @@ fn lo_handle_io_cmd_sync(q: &UblkQueue<'_>, tag: u16, i: &UblkIOCtx, buf_addr: *
         // either start to handle or retry
         let off = (iod.start_sector << 9) as u64;
         let bytes = (iod.nr_sectors << 9) as u32;
-        let sqe = __lo_make_io_sqe(op, off, bytes, buf_addr);
-        q.ublk_submit_sqe_sync(sqe, data).unwrap();
+        let sqe = __lo_make_io_sqe(op, off, bytes, buf_addr).user_data(data);
+        q.ublk_submit_sqe_sync(sqe).unwrap();
     }
 }
 

src/io.rs

@@ -796,13 +796,7 @@ impl UblkQueue<'_> {
     }
 
     #[inline]
-    pub fn ublk_submit_sqe_sync(
-        &self,
-        sqe: io_uring::squeue::Entry,
-        user_data: u64,
-    ) -> Result<(), UblkError> {
-        let sqe = sqe.user_data(user_data);
-
+    pub fn ublk_submit_sqe_sync(&self, sqe: io_uring::squeue::Entry) -> Result<(), UblkError> {
         loop {
             let res = unsafe { self.q_ring.borrow_mut().submission().push(&sqe) };