fix accidental closure on parent testing.T. (#470)

internal/driver/driver_test.go

 		},
 	}
 	for _, test := range tagFilterTests {
-		t.Run(test.desc, func(*testing.T) {
+		t.Run(test.desc, func(t *testing.T) {
 			filter, err := compileTagFilter(test.desc, test.value, nil, &proftest.TestUI{T: t}, nil)
 			if err != nil {
 				t.Fatalf("tagFilter %s:%v", test.desc, err)
 		},
 	}
 	for _, test := range tagFilterTests {
-		t.Run(test.desc, func(*testing.T) {
+		t.Run(test.desc, func(t *testing.T) {
 			p := profile.Profile{Sample: make([]*profile.Sample, len(test.tagVals))}
 			for i, numLabel := range test.tagVals {
 				s := profile.Sample{
 		},
 	}
 	for _, test := range tagFilterTests {
-		t.Run(test.desc, func(*testing.T) {
+		t.Run(test.desc, func(t *testing.T) {
 			wantErrMsg := strings.Join([]string{"(", test.desc, ":Interpreted '", test.value[strings.Index(test.value, "=")+1:], "' as range, not regexp", ")"}, "")
 			filter, err := compileTagFilter(test.desc, test.value, test.identifiedUnits, &proftest.TestUI{T: t,
 				AllowRx: wantErrMsg}, nil)