fix staticcheck failures of test/e2e/upgrade

Author: SataQiu

hack/.staticcheck_failures

@@ -77,8 +77,6 @@ test/e2e/storage/drivers
 test/e2e/storage/testsuites
 test/e2e/storage/utils
 test/e2e/storage/vsphere
-test/e2e/upgrades
-test/e2e/upgrades/storage
 test/images/agnhost/dns
 test/images/agnhost/inclusterclient
 test/images/agnhost/net/nat

test/e2e/upgrades/services.go

@@ -49,11 +49,11 @@ func (t *ServiceUpgradeTest) Setup(f *framework.Framework) {
 	cs := f.ClientSet
 
 	ginkgo.By("creating a TCP service " + serviceName + " with type=LoadBalancer in namespace " + ns.Name)
-	tcpService, err := jig.CreateTCPService(func(s *v1.Service) {
+	_, err := jig.CreateTCPService(func(s *v1.Service) {
 		s.Spec.Type = v1.ServiceTypeLoadBalancer
 	})
 	framework.ExpectNoError(err)
-	tcpService, err = jig.WaitForLoadBalancer(e2eservice.GetServiceLoadBalancerCreationTimeout(cs))
+	tcpService, err := jig.WaitForLoadBalancer(e2eservice.GetServiceLoadBalancerCreationTimeout(cs))
 	framework.ExpectNoError(err)
 
 	// Get info to hit it with

test/e2e/upgrades/storage/volume_mode.go

@@ -38,10 +38,9 @@ const devicePath = "/mnt/volume1"
 // formatted and mounted like a nil/Filesystem PV after a downgrade to a version
 // where the BlockVolume feature is disabled
 type VolumeModeDowngradeTest struct {
-	pvSource *v1.PersistentVolumeSource
-	pv       *v1.PersistentVolume
-	pvc      *v1.PersistentVolumeClaim
-	pod      *v1.Pod
+	pv  *v1.PersistentVolume
+	pvc *v1.PersistentVolumeClaim
+	pod *v1.Pod
 }
 
 // Name returns the tracking name of the test.

test/e2e/upgrades/sysctl.go

@@ -80,8 +80,8 @@ func (t *SysctlUpgradeTest) verifySafeSysctlWork(f *framework.Framework) *v1.Pod
 	ginkgo.By("Creating a pod with safe sysctls")
 	safeSysctl := "net.ipv4.ip_local_port_range"
 	safeSysctlValue := "1024 1042"
-	validPod := sysctlTestPod("valid-sysctls", map[string]string{safeSysctl: safeSysctlValue})
-	validPod = f.PodClient().Create(t.validPod)
+	sysctlTestPod("valid-sysctls", map[string]string{safeSysctl: safeSysctlValue})
+	validPod := f.PodClient().Create(t.validPod)
 
 	ginkgo.By("Making sure the valid pod launches")
 	ev, err := f.PodClient().WaitForErrorEventOrSuccess(t.validPod)