fix variables that werent being called

Signed-off-by: Jessica Frazelle <acidburn@docker.com>

directory/directory_test.go

@@ -168,6 +168,9 @@ func TestMoveToSubdir(t *testing.T) {
 	}
 	// validate that the files were moved to the subdirectory
 	infos, err := ioutil.ReadDir(subDir)
+	if err != nil {
+		t.Fatal(err)
+	}
 	if len(infos) != 4 {
 		t.Fatalf("Should be four files in the subdir after the migration: actual length: %d", len(infos))
 	}

directory/directory_windows.go

@@ -5,17 +5,10 @@ package directory
 import (
 	"os"
 	"path/filepath"
-
-	"github.com/docker/docker/pkg/longpath"
 )
 
 // Size walks a directory tree and returns its total size in bytes.
 func Size(dir string) (size int64, err error) {
-	fixedPath, err := filepath.Abs(dir)
-	if err != nil {
-		return
-	}
-	fixedPath = longpath.AddPrefix(fixedPath)
 	err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, e error) error {
 		// Ignore directory sizes
 		if fileInfo == nil {