[automerger] Fix OOB access in mpeg4/h263 decoder am: ef4ce15700 am: 9832a2a3f4 am: 144ba69187 am: 6fa588c7b6 am: 88c0c4897c am: efd8f9e09a am: e545f3c8d3 am: 6cf42dbae7 am: 874ec86ebc am: ddf94140d7 am: 5ae4f028fe am: b7db5f9e59
am: 9e7e498bd7

Change-Id: I138beb8b4477925c5b8a7930867c6ceff7f8492f