[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 am: 349c2e28 am: 8cfcc9bc am: 230b1853

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



Change-Id: I6257afd6eebfacb15fa629c9d77230ce83d2d540
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>