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

Change-Id: Id244e1a1872462d64da300c0c461ee939a8f1f76