[PATCH] Fix bio RW_AHEAD test

This patch fixes the BIO_RW_AHEAD being tested at the wrong end
in the bio layer.

drivers/block/ll_rw_blk.c

@@ -1833,7 +1833,7 @@ static int __make_request(request_queue_t *q, struct bio *bio)
 
 	barrier = test_bit(BIO_RW_BARRIER, &bio->bi_rw);
 
-	ra = bio_flagged(bio, BIO_RW_AHEAD);
+	ra = bio->bi_rw & (1 << BIO_RW_AHEAD);
 
 again:
 	insert_here = NULL;