e1000e: cleanup strict checkpatch check

CHECK: multiple assignments should be avoided
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/ethtool.c

@@ -1942,7 +1942,8 @@ static int e1000_set_coalesce(struct net_device *netdev,
 		return -EINVAL;
 
 	if (ec->rx_coalesce_usecs == 4) {
-		adapter->itr = adapter->itr_setting = 4;
+		adapter->itr_setting = 4;
+		adapter->itr = adapter->itr_setting;
 	} else if (ec->rx_coalesce_usecs <= 3) {
 		adapter->itr = 20000;
 		adapter->itr_setting = ec->rx_coalesce_usecs;