net: ethernet: Use DIV_ROUND_UP instead of reimplementing its function

DIV_ROUND_UP has implemented the code-opened function. Therefore, just
replace the implementation with DIV_ROUND_UP.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Acked-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/gianfar_ethtool.c

@@ -230,7 +230,7 @@ static unsigned int gfar_usecs2ticks(struct gfar_private *priv,
 
 	/* Make sure we return a number greater than 0
 	 * if usecs > 0 */
-	return (usecs * 1000 + count - 1) / count;
+	return DIV_ROUND_UP(usecs * 1000, count);
 }
 
 /* Convert ethernet clock ticks to microseconds */