apex: fix potential use-after-free of stack memory am: 9a7283d58f

Original change: https://android-review.googlesource.com/c/platform/system/apex/+/2051502

Change-Id: I61c4d758ddf967f0ad02186f2aa30d636996b428
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>