root element rename to testsuite

cmd/go2junit/go2junit.go

@@ -70,7 +70,8 @@ func main() {
 	filename := os.Args[1]
 	var file *os.File
 	if filename != "-" {
-		file, err := os.Open(filename)
+		file2, err := os.Open(filename)
+		file = file2
 		if err != nil {
 			panic(err)
 		}

cmd/go2junit/output.go

@@ -8,7 +8,7 @@ import (
 )
 
 type Testsuites struct {
-	XMLName xml.Name `xml:"testsuites"`
+	XMLName xml.Name `xml:"testsuite"`
 
 	Tests    int `xml:"tests,attr"`
 	Failures int `xml:"failures,attr"`