block: simplify queue_logical_block_size

queue_logical_block_size is never called with a 0 queue, and the
logical_block_size field in queue_limits is always initialized for
a live queue.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240627111407.476276-2-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/blkdev.h

@@ -1227,12 +1227,7 @@ static inline unsigned int bdev_max_segments(struct block_device *bdev)
 
 static inline unsigned queue_logical_block_size(const struct request_queue *q)
 {
-	int retval = 512;
-
-	if (q && q->limits.logical_block_size)
-		retval = q->limits.logical_block_size;
-
-	return retval;
+	return q->limits.logical_block_size;
 }
 
 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)