DO NOT MERGE Part of fix for libmedia OOB write anywhere
Clarify that decrypt destination is not a pointer for
secure case.
b/23223325
Change-Id: I642dcf790a9eb9e32175f3e0d8f040c82228e3ac
(cherry picked from commit ed555d70)
Ticket: CYNGNOS-985
(cherry picked from commit 0696c437)