Resolve travis-ci / gofmt issue with common.go

pkg/scsi/backingstore/common.go

@@ -18,8 +18,8 @@ package backingstore
 
 import (
 	"fmt"
-	"os"
 	"io"
+	"os"
 
 	"github.com/gostor/gotgt/pkg/api"
 	"github.com/gostor/gotgt/pkg/scsi"
@@ -68,7 +68,7 @@ func (bs *FileBackingStore) Open(dev *api.SCSILu, path string) error {
 
 	if err == nil {
 		// block device filesize needs to be treated differently
-		if mode&os.ModeDevice != 0 {
+		if (mode & os.ModeDevice) != 0 {
 			pos, err := f.Seek(0, io.SeekEnd)
 			if err != nil {
 				return err