[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 am: 5910d09c

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



Change-Id: I4233c73741154f2edbafd0e3534f2d4e09e1f2ba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>