hns3: fix unused function warning

Without CONFIG_PCI_IOV, we get a harmless warning about an
unused function:

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:2273:13: error: 'hclge_disable_sriov' defined but not used [-Werror=unused-function]

The #ifdefs in this driver are obviously wrong, so this just
removes them and uses an IS_ENABLED() check that does the same
thing correctly in a more readable way.

Fixes: 46a3df9f ("net: hns3: Add HNS3 Acceleration Engine & Compatibility Layer Support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -2272,7 +2272,6 @@ static void hclge_service_task(struct work_struct *work)
 
 static void hclge_disable_sriov(struct hclge_dev *hdev)
 {
-#ifdef CONFIG_PCI_IOV
 	/* If our VFs are assigned we cannot shut down SR-IOV
 	 * without causing issues, so just leave the hardware
 	 * available but disabled
@@ -2284,7 +2283,6 @@ static void hclge_disable_sriov(struct hclge_dev *hdev)
 	}
 
 	pci_disable_sriov(hdev->pdev);
-#endif
 }
 
 struct hclge_vport *hclge_get_vport(struct hnae3_handle *handle)
@@ -4182,9 +4180,8 @@ static void hclge_uninit_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 	set_bit(HCLGE_STATE_DOWN, &hdev->state);
 
-#ifdef CONFIG_PCI_IOV
+	if (IS_ENABLED(CONFIG_PCI_IOV))
 		hclge_disable_sriov(hdev);
-#endif
 
 	if (hdev->service_timer.data)
 		del_timer_sync(&hdev->service_timer);