mm/vmscan: remove sc->unqueued_dirty

No one is using it now, just remove it.

Suggested-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Kairui Song <kasong@tencent.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>

Author: ryncsn

mm/vmscan.c

@@ -169,7 +169,6 @@ struct scan_control {
 
 	struct {
 		unsigned int dirty;
-		unsigned int unqueued_dirty;
 		unsigned int congested;
 		unsigned int writeback;
 		unsigned int immediate;
@@ -2065,7 +2064,6 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan,
 
 	sc->nr.dirty += stat.nr_dirty;
 	sc->nr.congested += stat.nr_congested;
-	sc->nr.unqueued_dirty += stat.nr_unqueued_dirty;
 	sc->nr.writeback += stat.nr_writeback;
 	sc->nr.immediate += stat.nr_immediate;
 	sc->nr.taken += nr_taken;