btrfs: don't use the extent root in btrfs_chunk_alloc_add_chunk_item
We're just using the extent_root to set the chunk owner to root_key->objectid, which is BTRFS_EXTENT_TREE_OBJECTID, so use that directly instead of using the root. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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