SGISEEQ: fix oops when doing ifconfig down; ifconfig up

When doing init_ring checking whether a new skb needs to be allocated
was wrong.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/sgiseeq.c b/drivers/net/sgiseeq.c
index c69bb8b..78994ed 100644
--- a/drivers/net/sgiseeq.c
+++ b/drivers/net/sgiseeq.c
@@ -193,7 +193,7 @@
 
 	/* And now the rx ring. */
 	for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
-		if (!sp->rx_desc[i].rdma.pbuf) {
+		if (!sp->rx_desc[i].skb) {
 			dma_addr_t dma_addr;
 			struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);