pktcdvd: don't rely on bio_init() preserving bio->bi_destructor

Signed-off-by: Laurent Riffard <laurent.riffard@free.fr>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/block/pktcdvd.c

@@ -1147,6 +1147,7 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
 		bio->bi_end_io = pkt_end_io_read;
 		bio->bi_private = pkt;
 		bio->bi_io_vec = vec;
+		bio->bi_destructor = pkt_bio_destructor;
 
 		p = (f * CD_FRAMESIZE) / PAGE_SIZE;
 		offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
@@ -1444,6 +1445,7 @@ static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
 	pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
 	pkt->w_bio->bi_private = pkt;
 	pkt->w_bio->bi_io_vec = bvec;
+	pkt->w_bio->bi_destructor = pkt_bio_destructor;
 	for (f = 0; f < pkt->frames; f++)
 		if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
 			BUG();