[SG] Update drivers to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 9fbb39c..5b758b9 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1544,7 +1544,7 @@
 	struct scatterlist *sg = scsi_sglist(cmd);
 
 	if (sg) {
-		buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+		buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
 		buflen = sg->length;
 	} else {
 		buf = NULL;