block: remove the bdgrab in blk_drop_partitions
There is no need to hold a bdev reference when removing the partition. Signed-off-by: NChristoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210701081638.246552-3-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>
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