filesystem_freebsd: Use bytesToString to get label values

Signed-off-by: David O'Rourke <david.orourke@gmail.com>

collector/filesystem_freebsd.go

@@ -16,8 +16,6 @@
 package collector
 
 import (
-	"bytes"
-
 	"github.com/go-kit/kit/log/level"
 	"golang.org/x/sys/unix"
 )
@@ -42,19 +40,14 @@ func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
 	}
 	stats := []filesystemStats{}
 	for _, fs := range buf {
-		// We need to work out the lengths of the actual strings here,
-		// otherwuse we will end up with null bytes in our label values.
-		mountpoint_len := bytes.Index(fs.Mntonname[:], []byte{0})
-		mountpoint := string(fs.Mntonname[:mountpoint_len])
+		mountpoint := bytesToString(fs.Mntonname[:])
 		if c.ignoredMountPointsPattern.MatchString(mountpoint) {
 			level.Debug(c.logger).Log("msg", "Ignoring mount point", "mountpoint", mountpoint)
 			continue
 		}
 
-		device_len := bytes.Index(fs.Mntfromname[:], []byte{0})
-		fstype_len := bytes.Index(fs.Fstypename[:], []byte{0})
-		device := string(fs.Mntfromname[:device_len])
-		fstype := string(fs.Fstypename[:fstype_len])
+		device := bytesToString(fs.Mntfromname[:])
+		fstype := bytesToString(fs.Fstypename[:])
 		if c.ignoredFSTypesPattern.MatchString(fstype) {
 			level.Debug(c.logger).Log("msg", "Ignoring fs type", "type", fstype)
 			continue