Tremolo: Add check for bad return value in decode_map Test: poc in bug report Test: atest android.mediav2.cts.CodecDecoderTest Test: atest VtsHalMediaC2V1_0TargetAudioDecTest Test: atest VorbisDecoderTest Bug: 210625816 Change-Id: Ib1c25d524d8ca64d491212edb0625a6541ec6a3f (cherry picked from commit 3b8b8e610f2309a125b01d97a20c890ad820153b)