ClatCoordinator: fix erroneous .close() of fds without throw am: 7e8bea3cf9 am: 7c8084c14b am: 7ee54eb694 am: d0b897f531

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2121915

Change-Id: Ib8edd47bef84d67f91df562c99979701d41af893
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>