btrfs: use round_up wrapper in num_extent_pages
Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>