btrfs: scrub: remove unused nocow worker pointer
The member btrfs_fs_info::scrub_nocow_workers is unused since the nocow optimization was removed from scrub in 9bebe665 ("btrfs: scrub: Remove unused copy_nocow_pages and its callchain"). Reviewed-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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