mm/damon/paddr: minor refactor of damon_pa_pageout()

Patch series "mm/damon/paddr: minor code improvement", v3.

Unify folio_put() to make code more clear, and also fix minor issue in
damon_pa_young().


This patch (of 3):

Omit three lines by unified folio_put(), and make code more clear.

Link: https://lkml.kernel.org/r/20230308083311.120951-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20230308083311.120951-2-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/damon/paddr.c

@@ -238,21 +238,18 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
 		if (!folio)
 			continue;
 
-		if (damos_pa_filter_out(s, folio)) {
-			folio_put(folio);
-			continue;
-		}
+		if (damos_pa_filter_out(s, folio))
+			goto put_folio;
 
 		folio_clear_referenced(folio);
 		folio_test_clear_young(folio);
-		if (!folio_isolate_lru(folio)) {
-			folio_put(folio);
-			continue;
-		}
+		if (!folio_isolate_lru(folio))
+			goto put_folio;
 		if (folio_test_unevictable(folio))
 			folio_putback_lru(folio);
 		else
 			list_add(&folio->lru, &folio_list);
+put_folio:
 		folio_put(folio);
 	}
 	applied = reclaim_pages(&folio_list);