btrfs: block-group: refactor how we delete one block group item
When deleting a block group item, it's pretty straight forward, just delete the item pointed by the key. However it will not be that straight-forward for incoming skinny block group item. So refactor the block group item deletion into a new function, remove_block_group_item(), also to make the already lengthy btrfs_remove_block_group() a little shorter. Reviewed-by:Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:
Qu Wenruo <wqu@suse.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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