record: fix leaked private method

Author: bakape

frontend.go

@@ -69,7 +69,7 @@ func (f *Frontend) populate(k Key, rec *Record) (err error) {
 		for c := &rec.data; c != nil; c = c.next {
 			memoryUsed += c.Size()
 			if !first {
-				rec.frameDescriptor.Append(c.GetFrameDescriptor())
+				rec.frameDescriptor.append(c.GetFrameDescriptor())
 			} else {
 				first = false
 			}

writer.go

@@ -16,7 +16,7 @@ type frameDescriptor struct {
 }
 
 // Appending another frameDescriptor onto f
-func (f *frameDescriptor) Append(rhs frameDescriptor) {
+func (f *frameDescriptor) append(rhs frameDescriptor) {
 	f.size += rhs.size // Allowed to overflow
 
 	// Merge Adler32 checksums. Based on adler32_combine() from zlib.

writer_test.go

@@ -57,7 +57,7 @@ func TestAdlerAppend(t *testing.T) {
 	fd1 := genDesc(buf1)
 	fd2 := genDesc(buf2)
 	appended := fd1
-	appended.Append(fd2)
+	appended.append(fd2)
 	combined := genDesc(append(buf1, buf2...))
 	if appended != combined {
 		t.Fatalf("descriptors don't match: %+v != %+v", appended, combined)