r8169: remove manual padding in struct ring_info

The compiler takes care of alignment and padding, I see no need to
bother him with manual hints.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169.c

@@ -603,7 +603,6 @@ struct RxDesc {
 struct ring_info {
 	struct sk_buff	*skb;
 	u32		len;
-	u8		__pad[sizeof(void *) - sizeof(u32)];
 };
 
 struct rtl8169_counters {