btrfs: Remove unused next_root_backup function
This function has been superseded by previous commits and is no longer used so just remove it. Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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