btrfs: open code trivial helper btrfs_header_chunk_tree_uuid
The helper btrfs_header_chunk_tree_uuid follows naming convention of other struct accessors but does something compeletly different. As the offsetof calculation is clear in the context of extent buffer operations we can remove it. Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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