net: alteon: acenic: remove redundant pointer rxdesc

Pointer rxdesc is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'rxdesc' set but not used [-Wunused-but-set-variable]
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/alteon/acenic.c

@@ -1933,7 +1933,7 @@ static void ace_rx_int(struct net_device *dev, u32 rxretprd, u32 rxretcsm)
 	while (idx != rxretprd) {
 		struct ring_info *rip;
 		struct sk_buff *skb;
-		struct rx_desc *rxdesc, *retdesc;
+		struct rx_desc *retdesc;
 		u32 skbidx;
 		int bd_flags, desc_type, mapsize;
 		u16 csum;
@@ -1959,19 +1959,16 @@ static void ace_rx_int(struct net_device *dev, u32 rxretprd, u32 rxretcsm)
 		case 0:
 			rip = &ap->skb->rx_std_skbuff[skbidx];
 			mapsize = ACE_STD_BUFSIZE;
-			rxdesc = &ap->rx_std_ring[skbidx];
 			std_count++;
 			break;
 		case BD_FLG_JUMBO:
 			rip = &ap->skb->rx_jumbo_skbuff[skbidx];
 			mapsize = ACE_JUMBO_BUFSIZE;
-			rxdesc = &ap->rx_jumbo_ring[skbidx];
 			atomic_dec(&ap->cur_jumbo_bufs);
 			break;
 		case BD_FLG_MINI:
 			rip = &ap->skb->rx_mini_skbuff[skbidx];
 			mapsize = ACE_MINI_BUFSIZE;
-			rxdesc = &ap->rx_mini_ring[skbidx];
 			mini_count++;
 			break;
 		default: