rbd: set max_segment_size to UINT_MAX

Commit 21acdf45 ("rbd: set max_segments to USHRT_MAX") removed the
limit on max_segments.  Remove the limit on max_segment_size as well.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>

drivers/block/rbd.c

@@ -4378,7 +4378,7 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
 	blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE);
 	q->limits.max_sectors = queue_max_hw_sectors(q);
 	blk_queue_max_segments(q, USHRT_MAX);
-	blk_queue_max_segment_size(q, segment_size);
+	blk_queue_max_segment_size(q, UINT_MAX);
 	blk_queue_io_min(q, segment_size);
 	blk_queue_io_opt(q, segment_size);