pktcdvd: add kobject_put when kobject register fails

In kobject_register, the kobject reference is get in kobject_init, and then
kobject_add.  If kobject_add fail, it will only cleanup the reference got
by itself.
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Greg KH <greg@kroah.com>
Cc: Peter Osterlund <petero2@telia.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/block/pktcdvd.c

@@ -117,8 +117,10 @@ static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
 	p->kobj.parent = parent;
 	p->kobj.ktype = ktype;
 	p->pd = pd;
-	if (kobject_register(&p->kobj) != 0)
+	if (kobject_register(&p->kobj) != 0) {
+		kobject_put(&p->kobj);
 		return NULL;
+	}
 	return p;
 }
 /*