Fix RTT NPE due to ImsCall#close being called am: fff67ce3
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/net/ims/+/18973189 Change-Id: Ib3e8c0f7d85c6b82b0a395468f38b584afe1a942 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
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