fmq_unit_tests: remove objects form the heap am: cdf8d33b16 am: 6a21b5f737

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/2230529

Change-Id: I86dcaa344f324b9883351b70f99f29f03f64e1cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>