[automerge] libstagefright: fix heap use after free issue 2p: 2bddcbdd am:...

[automerge] libstagefright: fix heap use after free issue 2p: 2bddcbdd am: 55383b7c am: ede04005

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/20068332



Change-Id: Iaf8da269082bd770ac60c42fc71c899b343a2a07
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>