drivers: fix integer as NULL pointer warnings

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/rio/rioroute.c b/drivers/char/rio/rioroute.c
index 85091ff..7a9df7d 100644
--- a/drivers/char/rio/rioroute.c
+++ b/drivers/char/rio/rioroute.c
@@ -526,7 +526,7 @@
 			 ** If RTA is not powered on, the tx packets will be
 			 ** unset, so go no further.
 			 */
-			if (PortP->TxStart == 0) {
+			if (!PortP->TxStart) {
 				rio_dprintk(RIO_DEBUG_ROUTE, "Tx pkts not set up yet\n");
 				rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 				break;