spidernet : fix memory leak in spider_net_stop

We forget to call spider_net_free_rx_chain_contents which does the
actual dev_kfree_skb. New skbs are allocated from skbuff_head_cache
on each "ifconfig up" letting the cache grow infinitely.

This patch fixes it.

Signed-off-by: Jens Osterkamp <jens@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index ebb6aa3..8ea2fc1 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1925,6 +1925,8 @@
 	/* release chains */
 	spider_net_release_tx_chain(card, 1);
 
+	spider_net_free_rx_chain_contents(card);
+
 	spider_net_free_chain(card, &card->tx_chain);
 	spider_net_free_chain(card, &card->rx_chain);