IOMX: do not clear buffer if it's allocated by component am: ea76573aa2 am: 86d9bb9141 am: dfe5b5193c am: b308b1a5d9 am: 87415a74ee am: 130eb563b8 am: 106a9050b9
am: 53de578e88

Change-Id: I1096e2aa34eb9b89495f8ef7d4648ded5ee6381f