[Openais] [whitetank-patch] fix assertion on checkpoint close under heavy load

[Steven Dake]

In rare circumstances under overload conditions, disconnecting an IPC
connection from IPC using the checkpoint service and thousands of
checkpoints can result in an assertion in the executive.

The solution is that the close routine should return -1 to the
lib_exit_fn function, which should then return and continue processing
later as per the API semantics.

Patch attached to fix.

Regards
-steve
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