Btrfs: remove no longer used member num_dirty_bgs from transaction
The member num_dirty_bgs of struct btrfs_transaction is not used anymore, it is set and incremented but nothing reads its value anymore. Its last read use was removed by commit 64403612 ("btrfs: rework btrfs_check_space_for_delayed_refs"). So just remove that member. Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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