block: always use 'e' when printing scheduler name

Printing e->elevator_name in all cases improves the readability, and
'e' and 'cur' are identical in this branch.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Link: https://lore.kernel.org/r/4bae180ffbac608ea0cf46ffa9739ce0973b60aa.1669736350.git.nickyc975@zju.edu.cnSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/elevator.c

@@ -777,7 +777,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
 	spin_lock(&elv_list_lock);
 	list_for_each_entry(e, &elv_list, list) {
 		if (e == cur)
-			len += sprintf(name+len, "[%s] ", cur->elevator_name);
+			len += sprintf(name+len, "[%s] ", e->elevator_name);
 		else if (elv_support_features(q, e))
 			len += sprintf(name+len, "%s ", e->elevator_name);
 	}