all: fix golangci-lint issues (#3064)

hscontrol/policy/policyutil/reduce.go

@@ -18,6 +18,7 @@ func ReduceFilterRules(node types.NodeView, rules []tailcfg.FilterRule) []tailcf
 	for _, rule := range rules {
 		// record if the rule is actually relevant for the given node.
 		var dests []tailcfg.NetPortRange
+
 	DEST_LOOP:
 		for _, dest := range rule.DstPorts {
 			expanded, err := util.ParseIPSet(dest.IP, nil)

hscontrol/policy/policyutil/reduce_test.go

@@ -798,10 +798,14 @@ func TestReduceFilterRules(t *testing.T) {
 	for _, tt := range tests {
 		for idx, pmf := range policy.PolicyManagerFuncsForTest([]byte(tt.pol)) {
 			t.Run(fmt.Sprintf("%s-index%d", tt.name, idx), func(t *testing.T) {
-				var pm policy.PolicyManager
-				var err error
+				var (
+					pm  policy.PolicyManager
+					err error
+				)
+
 				pm, err = pmf(users, append(tt.peers, tt.node).ViewSlice())
 				require.NoError(t, err)
+
 				got, _ := pm.Filter()
 				t.Logf("full filter:\n%s", must.Get(json.MarshalIndent(got, "", "  ")))
 				got = policyutil.ReduceFilterRules(tt.node.View(), got)