fix(client): CompareAndSwap

Signed-off-by: James Yin <[email protected]>

client/pkg/eventlog/segment.go

@@ -123,7 +123,7 @@ func (s *segment) Update(ctx context.Context, r *record.Segment, towrite bool) e
 	// When a segment become read-only, the end offset needs to be set to the real value.
 	// TODO(wenfeng) data race?
 	s.lastEventBornAt = r.LastEventBornAt
-	if s.Writable() && !r.Writable && s.writable.CAS(true, false) {
+	if s.Writable() && !r.Writable && s.writable.CompareAndSwap(true, false) {
 		s.endOffset.Store(r.EndOffset)
 		return nil
 	}