ref: ebe160568b163bfae72f654ee517a12d838d8595
parent: dbae98082c1129191db46d94ddb45609fc7897c4
author: Yaowu Xu <yaowu@google.com>
date: Wed Jan 22 04:10:44 EST 2014
Prevent invaid memory access Reading second motion vector only when it has a second ref_frame Change-Id: Ica72c1cd955832e15ceccda5e5a17b0bfcd83044