fix pkg/controller/nodeipam staticcheck

Author: wawa0210

hack/.staticcheck_failures

@@ -1,7 +1,6 @@
 cluster/images/etcd/migrate
 pkg/controller/deployment
 pkg/controller/garbagecollector
-pkg/controller/nodeipam
 pkg/controller/podautoscaler
 pkg/controller/replicaset
 pkg/controller/resourcequota

pkg/controller/nodeipam/BUILD

@@ -34,7 +34,6 @@ go_library(
     deps = [
         "//pkg/controller/nodeipam/ipam:go_default_library",
         "//pkg/controller/nodeipam/ipam/sync:go_default_library",
-        "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
         "//staging/src/k8s.io/client-go/informers/core/v1:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",

pkg/controller/nodeipam/node_ipam_controller.go

@@ -28,7 +28,6 @@ import (
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/tools/record"
 
-	v1 "k8s.io/api/core/v1"
 	coreinformers "k8s.io/client-go/informers/core/v1"
 	clientset "k8s.io/client-go/kubernetes"
 	corelisters "k8s.io/client-go/listers/core/v1"
@@ -65,8 +64,6 @@ type Controller struct {
 	nodeInformerSynced cache.InformerSynced
 
 	cidrAllocator ipam.CIDRAllocator
-
-	forcefullyDeletePod func(*v1.Pod) error
 }
 
 // NewNodeIpamController returns a new node IP Address Management controller to