libct/cg/fs2/hugetlb: use fscommon.GetValueByKey

This makes the code simpler and more future-proof, in case
any more values will appear in hugetlb.*.events.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/cgroups/fs2/hugetlb.go

@@ -4,7 +4,6 @@ package fs2
 
 import (
 	"strconv"
-	"strings"
 
 	"github.com/pkg/errors"
 
@@ -45,14 +44,10 @@ func statHugeTlb(dirPath string, stats *cgroups.Stats) error {
 		hugetlbStats.Usage = value
 
 		fileName := "hugetlb." + pagesize + ".events"
-		contents, err := fscommon.ReadFile(dirPath, fileName)
+		value, err = fscommon.GetValueByKey(dirPath, fileName, "max")
 		if err != nil {
 			return errors.Wrap(err, "failed to read stats")
 		}
-		_, value, err = fscommon.ParseKeyValue(strings.TrimSuffix(contents, "\n"))
-		if err != nil {
-			return errors.Wrap(err, "failed to parse "+fileName)
-		}
 		hugetlbStats.Failcnt = value
 
 		stats.HugetlbStats[pagesize] = hugetlbStats