btrfs: delayed-ref: Use btrfs_ref to refactor btrfs_add_delayed_data_ref()
Just like btrfs_add_delayed_tree_ref(), use btrfs_ref to refactor btrfs_add_delayed_data_ref(). Signed-off-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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