pktcdvd: check for NULL returna fter calling bio_split_to_limits()

The revert of the removal of this driver happened after we fixed up
the split limits for NOWAIT issue, hence it got missed. Ensure that
we check for a NULL bio after splitting, in case it should be retried.

Marking this as fixing both commits, so that stable backport will do
this correctly.

Cc: [email protected]
Fixes: 9cea62b ("block: don't allow splitting of a REQ_NOWAIT bio")
Fixes: 4b83e99 ("Revert "pktcdvd: remove driver."")
Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

drivers/block/pktcdvd.c

@@ -2400,6 +2400,8 @@ static void pkt_submit_bio(struct bio *bio)
 	struct bio *split;
 
 	bio = bio_split_to_limits(bio);
+	if (!bio)
+		return;
 
 	pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
 		(unsigned long long)bio->bi_iter.bi_sector,