ublk: remove two unused fields from 'struct ublk_queue'

Remove two unused fields(`io_addr` & `max_io_sz`) from `struct ublk_queue`.

Reviewed-by: Caleb Sander Mateos <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Ming Lei

drivers/block/ublk_drv.c

@@ -143,8 +143,6 @@ struct ublk_queue {
 	struct task_struct	*ubq_daemon;
 	char *io_cmd_buf;
 
-	unsigned long io_addr;	/* mapped vm address */
-	unsigned int max_io_sz;
 	bool force_abort;
 	bool timeout;
 	bool canceling;