net: macb: kill useless use of list_empty()

The list_for_each_entry() macro already handles the case where the list
is empty (by not executing the loop body).  It's not necessary to handle
this case specially, so stop doing so.

Cc: Rafal Ozieblo <rafalo@cadence.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb_main.c

@@ -2812,9 +2812,6 @@ static int gem_add_flow_filter(struct net_device *netdev,
 			htons(fs->h_u.tcp_ip4_spec.psrc), htons(fs->h_u.tcp_ip4_spec.pdst));
 
 	/* find correct place to add in list */
-	if (list_empty(&bp->rx_fs_list.list))
-		list_add(&newfs->list, &bp->rx_fs_list.list);
-	else {
 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
 		if (item->fs.location > newfs->fs.location) {
 			list_add_tail(&newfs->list, &item->list);
@@ -2829,7 +2826,6 @@ static int gem_add_flow_filter(struct net_device *netdev,
 	}
 	if (!added)
 		list_add_tail(&newfs->list, &bp->rx_fs_list.list);
-	}
 
 	gem_prog_cmp_regs(bp, fs);
 	bp->rx_fs_list.count++;
@@ -2851,9 +2847,6 @@ static int gem_del_flow_filter(struct net_device *netdev,
 	struct ethtool_rx_fs_item *item;
 	struct ethtool_rx_flow_spec *fs;
 
-	if (list_empty(&bp->rx_fs_list.list))
-		return -EINVAL;
-
 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
 		if (item->fs.location == cmd->fs.location) {
 			/* disable screener regs for the flow entry */