chore(wireguard): fix netlink integration test

- Broken since recent commit 9d1a0b60a2

internal/wireguard/netlink_integration_test.go

@@ -57,7 +57,9 @@ func Test_netlink_Wireguard_addAddresses(t *testing.T) {
 		},
 	}
 
-	// Success
+	const addIterations = 2 // initial + replace
+
+	for i := 0; i < addIterations; i++ {
 		err = wg.addAddresses(link, addresses)
 		require.NoError(t, err)
 
@@ -70,11 +72,7 @@ func Test_netlink_Wireguard_addAddresses(t *testing.T) {
 			require.NoError(t, err)
 			assert.Equal(t, addresses[i], ipNet)
 		}
-
-	// Existing address cannot be added
-	err = wg.addAddresses(link, addresses)
-	require.Error(t, err)
-	assert.EqualError(t, err, "file exists: when adding address 1.2.3.4/32 to link test_8081")
+	}
 }
 
 func Test_netlink_Wireguard_addRule(t *testing.T) {