drivers/usb/eth/smsc95xx.c: Fix GCC 4.6 warning

Fix:
smsc95xx.c: In function 'smsc95xx_eth_get_info':
smsc95xx.c:869:12: warning: assignment from incompatible pointer type
[enabled by default]

Signed-off-by: Anatolij Gustschin <agust@denx.de>

drivers/usb/eth/smsc95xx.c

@@ -657,8 +657,7 @@ static int smsc95xx_init(struct eth_device *eth, bd_t *bd)
 	return 0;
 }
 
-static int smsc95xx_send(struct eth_device *eth, volatile void* packet,
-			 int length)
+static int smsc95xx_send(struct eth_device *eth, void* packet, int length)
 {
 	struct ueth_data *dev = (struct ueth_data *)eth->priv;
 	int err;