io_uring: kill unused param from io_file_supports_nowait

io_file_supports_nowait() doesn't use rw argument anymore, remove it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4bd6709fc573d70c866ea656cb7a7dbe94be8026.1634987320.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -2809,8 +2809,7 @@ static inline bool io_file_supports_nowait(struct io_kiocb *req)
 	return req->flags & REQ_F_SUPPORT_NOWAIT;
 }
 
-static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
-		      int rw)
+static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_ring_ctx *ctx = req->ctx;
 	struct kiocb *kiocb = &req->rw.kiocb;
@@ -3352,7 +3351,7 @@ static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	if (unlikely(!(req->file->f_mode & FMODE_READ)))
 		return -EBADF;
-	return io_prep_rw(req, sqe, READ);
+	return io_prep_rw(req, sqe);
 }
 
 /*
@@ -3568,7 +3567,7 @@ static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
 		return -EBADF;
-	return io_prep_rw(req, sqe, WRITE);
+	return io_prep_rw(req, sqe);
 }
 
 static int io_write(struct io_kiocb *req, unsigned int issue_flags)