mm/rmap: change the type of we_locked from int to bool

Change the type of we_locked from int to bool because folio_trylock return
bool

Link: https://lkml.kernel.org/r/20240428012049.8182-1-gehao@kylinos.cnSigned-off-by: Hao Ge <gehao@kylinos.cn>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/rmap.c

@@ -964,7 +964,7 @@ static bool invalid_folio_referenced_vma(struct vm_area_struct *vma, void *arg)
 int folio_referenced(struct folio *folio, int is_locked,
 		     struct mem_cgroup *memcg, unsigned long *vm_flags)
 {
-	int we_locked = 0;
+	bool we_locked = false;
 	struct folio_referenced_arg pra = {
 		.mapcount = folio_mapcount(folio),
 		.memcg = memcg,