btrfs: Remove root argument in extent_data_ref_count()
Because it is never used. Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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Because it is never used. Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>