Refactoring variable declaration and value setting

cmd/kubeadm/app/phases/addons/dns/dns_test.go

@@ -862,8 +862,7 @@ metadata:
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			out := &bytes.Buffer{}
-			var replicas int32
-			replicas = 3
+			var replicas int32 = 3
 			if err := coreDNSAddon(tt.args.cfg, tt.args.client, &replicas, out, tt.args.printManifest); (err != nil) != tt.wantErr {
 				t.Errorf("coreDNSAddon() error = %v, wantErr %v", err, tt.wantErr)
 				return