btrfs: backref: rename and move drop_backref_node()
With extra comment for drop_backref_node() as it has some similarity with remove_backref_node(), thus we need extra comment explaining the difference. Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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