io_uring/kbuf: use 'ctx' consistently

There's already a local ctx variable, yet the ring lock and unlock
helpers use req->ctx. use ctx consistently.

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

Author: axboe

io_uring/kbuf.c

@@ -225,7 +225,7 @@ struct io_br_sel io_buffer_select(struct io_kiocb *req, size_t *len,
 	struct io_br_sel sel = { };
 	struct io_buffer_list *bl;
 
-	io_ring_submit_lock(req->ctx, issue_flags);
+	io_ring_submit_lock(ctx, issue_flags);
 
 	bl = io_buffer_get_list(ctx, buf_group);
 	if (likely(bl)) {
@@ -234,7 +234,7 @@ struct io_br_sel io_buffer_select(struct io_kiocb *req, size_t *len,
 		else
 			sel.addr = io_provided_buffer_select(req, len, bl);
 	}
-	io_ring_submit_unlock(req->ctx, issue_flags);
+	io_ring_submit_unlock(ctx, issue_flags);
 	return sel;
 }