via-velocity: remove null pointer check on array tdinfo->skb_dma

tdinfo->skb_dma is a 7 element array of dma_addr_t hence cannot be
null, so the pull pointer check on tdinfo->skb_dma  is redundant.
Remove it.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Acked-by: NFrancois Romieu <romieu@fr.zoreil.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/via/via-velocity.c

@@ -1724,13 +1724,11 @@ static void velocity_free_tx_buf(struct velocity_info *vptr,
 		struct velocity_td_info *tdinfo, struct tx_desc *td)
 {
 	struct sk_buff *skb = tdinfo->skb;
+	int i;
 
 	/*
 	 *	Don't unmap the pre-allocated tx_bufs
 	 */
-	if (tdinfo->skb_dma) {
-		int i;
-
 	for (i = 0; i < tdinfo->nskb_dma; i++) {
 		size_t pktlen = max_t(size_t, skb->len, ETH_ZLEN);
 
@@ -1742,7 +1740,6 @@ static void velocity_free_tx_buf(struct velocity_info *vptr,
 		dma_unmap_single(vptr->dev, tdinfo->skb_dma[i],
 				 le16_to_cpu(pktlen), DMA_TO_DEVICE);
 	}
-	}
 	dev_kfree_skb_irq(skb);
 	tdinfo->skb = NULL;
 }