igbvf: add missing iounmap() on error in igbvf_probe()

Add the missing iounmap() before return from igbvf_probe()
in the error handling case.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Tested-by: Sibai Li <Sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igbvf/netdev.c

@@ -2698,7 +2698,7 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ei->get_variants) {
 		err = ei->get_variants(adapter);
 		if (err)
-			goto err_ioremap;
+			goto err_get_variants;
 	}
 
 	/* setup adapter struct */
@@ -2795,6 +2795,7 @@ err_hw_init:
 	kfree(adapter->rx_ring);
 err_sw_init:
 	igbvf_reset_interrupt_capability(adapter);
+err_get_variants:
 	iounmap(adapter->hw.hw_addr);
 err_ioremap:
 	free_netdev(netdev);