net/macb: replace macb_count_tx_descriptors() by DIV_ROUND_UP()

macb_count_tx_descriptors() repeats the generic macro DIV_ROUND_UP(). The patch
does a replacement.

There is no functional change.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb.c

@@ -1157,12 +1157,6 @@ static void macb_poll_controller(struct net_device *dev)
 }
 #endif
 
-static inline unsigned int macb_count_tx_descriptors(struct macb *bp,
-						     unsigned int len)
-{
-	return (len + bp->max_tx_length - 1) / bp->max_tx_length;
-}
-
 static unsigned int macb_tx_map(struct macb *bp,
 				struct macb_queue *queue,
 				struct sk_buff *skb)
@@ -1313,11 +1307,11 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	 * socket buffer: skb fragments of jumbo frames may need to be
 	 * splitted into many buffer descriptors.
 	 */
-	count = macb_count_tx_descriptors(bp, skb_headlen(skb));
+	count = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
 	nr_frags = skb_shinfo(skb)->nr_frags;
 	for (f = 0; f < nr_frags; f++) {
 		frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
-		count += macb_count_tx_descriptors(bp, frag_size);
+		count += DIV_ROUND_UP(frag_size, bp->max_tx_length);
 	}
 
 	spin_lock_irqsave(&bp->lock, flags);