Do not crash when server channel has closed

If the publisher has been destroyed (or, equivalently, if the server
channel was closed), the consumer should not crash. Instead, we should
allow consumer to exit gracefully.

In this CL, we specifically check for DEAD_OBJECT and drain the queue,
printing all of the events that will never be delivered to the publisher
for useful debugging purposes.

Bug: 305165753
Test: TEST=libinput_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST
Flag: EXEMPT bugfix

Change-Id: I00973ebb87e0f59bfd3c0f58edf7355b28988c15