Fix epoll leaks: clean up file descriptor and epoll instance properly am: 6dddd6f4 am: 6d9af658

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/21914922



Change-Id: Icfc77589a28717cf9b742a7255f522ee71406631
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>