block: unexport revalidate_disk_size

revalidate_disk_size is now only called from set_capacity_and_notify,
so drop the export.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/block_dev.c

@@ -1362,7 +1362,6 @@ void revalidate_disk_size(struct gendisk *disk, bool verbose)
 		bdput(bdev);
 	}
 }
-EXPORT_SYMBOL(revalidate_disk_size);
 
 void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors)
 {