btrfs: zlib: use copy_page for full page copy
The copy_page helper may use an optimized version for full page copy (eg. on s390 there's a special instruction for that), there's one more left to convert. Reviewed-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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