misc: fix integer as NULL pointer warnings

drivers/md/raid10.c:889:17: warning: Using plain integer as NULL pointer
drivers/media/video/cx18/cx18-driver.c:616:12: warning: Using plain integer as NULL pointer
sound/oss/kahlua.c:70:12: warning: Using plain integer as NULL pointer
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/md/raid10.c

@@ -886,7 +886,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
 	 */
 	raid10_find_phys(conf, r10_bio);
  retry_write:
-	blocked_rdev = 0;
+	blocked_rdev = NULL;
 	rcu_read_lock();
 	for (i = 0;  i < conf->copies; i++) {
 		int d = r10_bio->devs[i].devnum;

drivers/media/video/cx18/cx18-driver.c

@@ -613,7 +613,7 @@ static int __devinit cx18_probe(struct pci_dev *dev,
 	}
 
 	cx = kzalloc(sizeof(struct cx18), GFP_ATOMIC);
-	if (cx == 0) {
+	if (!cx) {
 		spin_unlock(&cx18_cards_lock);
 		return -ENOMEM;
 	}

sound/oss/kahlua.c

@@ -67,7 +67,7 @@ static int __devinit probe_one(struct pci_dev *pdev, const struct pci_device_id
 		return 1;
 	
 	mem = ioremap(base, 128);
-	if(mem == 0UL)
+	if (!mem)
 		return 1;
 	map = readw(mem + 0x18);	/* Read the SMI enables */
 	iounmap(mem);