[Openais] lock service segfaults if compiled with -DDEBUG

[Steven Dake]

This is caused by list_del setting the removed data structure to some
invalid value (deadb33f) to catch double list_dels that shouldn't
happen.  In this case, the EX lock is always deleted from whichever list
it is on and hence should not be deleted during a lock or unlock
operation from the list again.

Regards

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