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

[automerge] libstagefright: fix heap use after free issue 2p: 2bddcbdd 2p: a648552f am: d56cb24c am: 5133d691

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



Change-Id: I7429445bd86b83555f26ce5d645a128febe10aaa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>