libstagefright: check requested memory size before allocation for SoftMPEG4Encoder
and SoftVPXEncoder

Bug: 25812794.
Change-Id: I96dc74734380d462583f6efa33d09946f9532809
(cherry picked from commit 87f8cbb223ee516803dbb99699320c2484cbf3ba)
(cherry picked from commit 69bd1cf225328e64a5b4ae6935d2b7fe0b7b6400)
2 files changed