s2io.c: Convert skipped nic->config.tx_cfg[i]. to tx_cfg->

Missed doing the conversion in earlier patch.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 06223df..1d13f60 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -1001,7 +1001,7 @@
 			swstats->mem_freed += PAGE_SIZE;
 		}
 		kfree(fifo->list_info);
-		swstats->mem_freed += nic->config.tx_cfg[i].fifo_len *
+		swstats->mem_freed += tx_cfg->fifo_len *
 			sizeof(struct list_info_hold);
 	}