tulip: Add missing parens.

As reported by Stephen Rothwell.

drivers/net/tulip/uli526x.c: In function 'uli526x_rx_packet':
drivers/net/tulip/uli526x.c:861: warning: assignment makes pointer from integer without a cast

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tulip/uli526x.c b/drivers/net/tulip/uli526x.c
index 90be57b..a4f09d4 100644
--- a/drivers/net/tulip/uli526x.c
+++ b/drivers/net/tulip/uli526x.c
@@ -858,7 +858,7 @@
 				/* Good packet, send to upper layer */
 				/* Shorst packet used new SKB */
 				if ((rxlen < RX_COPY_SIZE) &&
-				    ((new_skb = dev_alloc_skb(rxlen + 2) != NULL))) {
+				    (((new_skb = dev_alloc_skb(rxlen + 2)) != NULL))) {
 					skb = new_skb;
 					/* size less than COPY_SIZE, allocate a rxlen SKB */
 					skb_reserve(skb, 2); /* 16byte align */