mm:Clean page_io revert conflict

Moto zram writeback has conflicts with mglru
There is some merge error after reverted the
zram writeback changes, clean it for correct logic

Change-Id: I4ba5093dae7eab5ecc3cb16bab0ddfe793342306
Reviewed-on: https://gerrit.mot.com/2281591
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key

mm/page_io.c

@@ -74,6 +74,7 @@ void end_swap_bio_write(struct bio *bio)
 	bio_put(bio);
 }
 
+
 static void end_swap_bio_read(struct bio *bio)
 {
 	struct page *page = bio_first_page_all(bio);
@@ -337,6 +338,13 @@ int swap_readpage(struct page *page, bool synchronous)
 		goto out;
 	}
 
+	ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
+	if (!ret) {
+
+		count_vm_event(PSWPIN);
+		goto out;
+	}
+
 	ret = 0;
 	bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
 	if (bio == NULL) {