block: make add_partition() return pointer to hd_struct
Make add_partition() return pointer to the new hd_struct on success and ERR_PTR() value on failure. This change will be used to fix md autodetection bug. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: Neil Brown <neilb@suse.de> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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