Update files based on go lint

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

fs/du.go

@@ -1,5 +1,6 @@
 package fs
 
+// Usage of disk information
 type Usage struct {
 	Inodes int64
 	Size   int64

fs/fstest/file.go

@@ -26,12 +26,7 @@ func CreateFile(name string, content []byte, perm os.FileMode) Applier {
 		if err := ioutil.WriteFile(fullPath, content, perm); err != nil {
 			return err
 		}
-
-		if err := os.Chmod(fullPath, perm); err != nil {
-			return err
-		}
-
-		return nil
+		return os.Chmod(fullPath, perm)
 	})
 }
 

fs/fstest/file_unix.go

@@ -4,6 +4,7 @@ package fstest
 
 import "github.com/containerd/continuity/sysx"
 
+// SetXAttr sets the xatter for the file
 func SetXAttr(name, key, value string) Applier {
 	return applyFn(func(root string) error {
 		return sysx.LSetxattr(name, key, []byte(value), 0)

fs/fstest/testsuite.go

@@ -7,11 +7,13 @@ import (
 	"testing"
 )
 
+// TestApplier applies the test context
 type TestApplier interface {
 	TestContext(context.Context) (context.Context, func(), error)
 	Apply(context.Context, Applier) (string, func(), error)
 }
 
+// FSSuite runs the path test suite
 func FSSuite(t *testing.T, a TestApplier) {
 	t.Run("Basic", makeTest(t, a, basicTest))
 	t.Run("Deletion", makeTest(t, a, deletionTest))

fs/hardlink.go

@@ -2,7 +2,7 @@ package fs
 
 import "os"
 
-// GetLinkID returns an identifier representing the node a hardlink is pointing
+// GetLinkInfo returns an identifier representing the node a hardlink is pointing
 // to. If the file is not hard linked then 0 will be returned.
 func GetLinkInfo(fi os.FileInfo) (uint64, bool) {
 	return getLinkInfo(fi)