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

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

Change-Id: I7d670a855df0580cf2e0e49a3246956d54c6bc6e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>