mm: memory: use folio_throttle_swaprate() in wp_page_copy()

Directly use folio_throttle_swaprate() instead of
cgroup_throttle_swaprate().

Link: https://lkml.kernel.org/r/20230302115835.105364-5-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memory.c

@@ -3092,7 +3092,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 
 	if (mem_cgroup_charge(new_folio, mm, GFP_KERNEL))
 		goto oom_free_new;
-	cgroup_throttle_swaprate(&new_folio->page, GFP_KERNEL);
+	folio_throttle_swaprate(new_folio, GFP_KERNEL);
 
 	__folio_mark_uptodate(new_folio);