tulip: Fix null dereference in uli526x_rx_packet()

Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tulip/uli526x.c

@@ -851,13 +851,15 @@ static void uli526x_rx_packet(struct net_device *dev, struct uli526x_board_info
 
 			if ( !(rdes0 & 0x8000) ||
 				((db->cr6_data & CR6_PM) && (rxlen>6)) ) {
+				struct sk_buff *new_skb = NULL;
+
 				skb = rxptr->rx_skb_ptr;
 
 				/* Good packet, send to upper layer */
 				/* Shorst packet used new SKB */
-				if ( (rxlen < RX_COPY_SIZE) &&
-					( (skb = dev_alloc_skb(rxlen + 2) )
-					!= NULL) ) {
+				if ((rxlen < RX_COPY_SIZE) &&
+				    ((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 */
 					memcpy(skb_put(skb, rxlen),