DO NOT MERGE omx: check buffer port before using am: 0e2cc67785 am: 5dd07a6ef3 am: beb7008c2e  -s ours am: 9e7442d243 am: 5ab9958989
am: e57fe76dac

Change-Id: I95aaa3f59f1382a68f89326ab012c850a36770a0