Fix possible panic when getting primary IPConfig

pkg/cloudprovider/providers/azure/azure_standard.go

@@ -221,6 +221,10 @@ func getPrimaryInterfaceID(machine compute.VirtualMachine) (string, error) {
 }
 
 func getPrimaryIPConfig(nic network.Interface) (*network.InterfaceIPConfiguration, error) {
+	if nic.IPConfigurations == nil {
+		return nil, fmt.Errorf("nic.IPConfigurations for nic (nicname=%q) is nil", *nic.Name)
+	}
+
 	if len(*nic.IPConfigurations) == 1 {
 		return &((*nic.IPConfigurations)[0]), nil
 	}
@@ -231,7 +235,7 @@ func getPrimaryIPConfig(nic network.Interface) (*network.InterfaceIPConfiguratio
 		}
 	}
 
-	return nil, fmt.Errorf("failed to determine the determine primary ipconfig. nicname=%q", *nic.Name)
+	return nil, fmt.Errorf("failed to determine the primary ipconfig. nicname=%q", *nic.Name)
 }
 
 func isInternalLoadBalancer(lb *network.LoadBalancer) bool {