block: add error handling for device_add_disk / add_disk

mainline inclusion
from mainline-v5.15-rc1
commit 83cbce95
category: bugfix
bugzilla: 188733

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=83cbce9574462c6b4eed6797bdaf18fae6859ab3



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Properly unwind on errors in device_add_disk.  This is the initial work
as drivers are not converted yet, which will follow in separate patches.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
[hch: major rebase.  All bugs are probably mine]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210818144542.19305-10-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>
conflicts:
  block/genhd.c
  include/linux/genhd.h
Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>
Signed-off-by: Li Nan <linan122@huawei.com>