[MTD] maps: sparse fixup

The patch below fixes the following sparse warning:

drivers/mtd/maps/nettel.c:482:27: warning: Using plain integer as NULL pointer
Signed-off-by: Luiz Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/maps/nettel.c

@@ -6,7 +6,7 @@
  *      (C) Copyright 2000-2001, Greg Ungerer (gerg@snapgear.com)
  *      (C) Copyright 2001-2002, SnapGear (www.snapgear.com)
  *
- *	$Id: nettel.c,v 1.11 2005/11/07 11:14:27 gleixner Exp $
+ *	$Id: nettel.c,v 1.12 2005/11/29 14:30:00 gleixner Exp $
  */
 
 /****************************************************************************/
@@ -479,7 +479,7 @@ void __exit nettel_cleanup(void)
 	}
 	if (nettel_intel_map.virt) {
 		iounmap(nettel_intel_map.virt);
-		nettel_intel_map.virt = 0;
+		nettel_intel_map.virt = NULL;
 	}
 #endif
 }