ocfs2/cluster: remove the hr_dev_name field from struct o2hb_region

Just print the block device name directly using the %pg format specifier.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Joel Becker <jlbec@evilplan.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220713055317.1888500-8-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>