btrfs: scrub: add assertions for worker pointers
The scrub worker pointers are not NULL iff the scrub is running, so reset them back once the last reference is dropped. Add assertions to the initial phase of scrub to verify that. Reviewed-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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