btrfs: extent-tree: cleanup one-shot usage of @blocksize in do_walk_down
@blocksize variable in do_walk_down() is only used once, really no need to declare it. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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