Fix a crash in STM when unregisterised
Fixes several test failures: ../../libraries/stm/tests 2411 [bad exit code] (normal,hpc,profasm,ghci,optllvm) ../../libraries/stm/tests stm046 [bad exit code] (normal,hpc,profasm,ghci,optllvm) ../../libraries/stm/tests stm061 [bad exit code] (normal,hpc,profasm,ghci,optllvm)
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