fix gofumpt lint

Signed-off-by: dongjiang1989 <dongjiang1989@126.com>

prometheus/testutil/testutil.go

@@ -264,7 +264,6 @@ func compareMetricFamilies(got, expected []*dto.MetricFamily, metricNames ...str
 // The error contains the encoded text of both the desired and the actual
 // result.
 func compare(got, want []*dto.MetricFamily) error {
-
 	var gotBuf, wantBuf bytes.Buffer
 	enc := expfmt.NewEncoder(&gotBuf, expfmt.NewFormat(expfmt.TypeTextPlain))
 	for _, mf := range got {

prometheus/testutil/testutil_test.go

@@ -305,22 +305,6 @@ func TestMetricNotFound(t *testing.T) {
 	expected := `
 		some_other_metric{label1="value1"} 1
 	`
-	/*
-	   	expectedError := `
-
-	   Diff:
-	   --- metric output does not match expectation; want
-	   +++ got:
-	   @@ -1,4 +1,4 @@
-	   -(bytes.Buffer) # HELP some_other_metric A value that represents a counter.
-	   -# TYPE some_other_metric counter
-	   -some_other_metric{label1="value1"} 1
-	   +(bytes.Buffer) # HELP some_total A value that represents a counter.
-	   +# TYPE some_total counter
-	   +some_total{label1="value1"} 1
-
-	   `
-	*/
 
 	expectedError := `