block: replace "len+name" with "name+len" in elv_iosched_show

The "pointer + offset" pattern is more resonable.
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/d9beaee71b14f7b2a39ab0db6458dc0f7d961ceb.1669736350.git.nickyc975@zju.edu.cnSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/elevator.c

@@ -783,7 +783,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
 	}
 	spin_unlock(&elv_list_lock);
 
-	len += sprintf(len+name, "\n");
+	len += sprintf(name+len, "\n");
 	return len;
 }