tokenring/3c359.c: Prevent possible mem leak when open failed

Freeing previously allocated buffers in case of error.

Signed-off-by: Jirka Pirko <jirka@pirko.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tokenring/3c359.c b/drivers/net/tokenring/3c359.c
index 8a43ecd..e7a9446 100644
--- a/drivers/net/tokenring/3c359.c
+++ b/drivers/net/tokenring/3c359.c
@@ -669,6 +669,8 @@
 	if (i==0) { 
 		printk(KERN_WARNING "%s: Not enough memory to allocate rx buffers. Adapter disabled \n",dev->name) ; 
 		free_irq(dev->irq,dev) ; 
+		kfree(xl_priv->xl_tx_ring);
+		kfree(xl_priv->xl_rx_ring);
 		return -EIO ; 
 	}