Fix stray pointer in e100

e100_alloc_cbs() allocates the cb's but does not set cb->skb = NULL which means that the following check in e100_tx_clean() will execute even though cb->skb is not really a valid pointer an we OOPs:

	if(likely(cb->skb != NULL)) {
		...
		nic->net_stats.tx_bytes += cb->skb->len;

	}

Attached patch fixes the issue.

~Deepak

Deepak Saxena - dsaxena at plexity dot net - http://www.plexity.net/

diff -Nru a/drivers/net/e100.c b/drivers/net/e100.c
@@ -1346,6 +1346,7 @@
 		cb->dma_addr = nic->cbs_dma_addr + i * sizeof(struct cb);
 		cb->link = cpu_to_le32(nic->cbs_dma_addr +
 			((i+1) % count) * sizeof(struct cb));
+		cb->skb = NULL;
 	}
 
 	nic->cb_to_use = nic->cb_to_send = nic->cb_to_clean = nic->cbs;