DO NOT MERGE - libstagefright: sanity check size before dereferencing pointer in Utils.cpp
Also remove some CHECK's.
Bug: 23680780
Change-Id: I62d0941e203e40209fa6fbe3f923f3efdc5a6c23
(cherry picked from commit 7bb772e0)
(cherry picked from commit c6a2815e)
Ticket: CYNGNOS-1189