RTEMS | cpukit: fix off-chain state checks and pointer clearing (!1067)

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on cpukit/rtems/src/semcreate.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1067#note_143092

 >    }
 >  
 >    if ( status != STATUS_SUCCESSFUL ) {
 > +    _Chain_Set_off_chain( &the_semaphore->Object.Node );

The problem here though is that the semaphore implementation is re-using the `Previous` field to cache some information, but never clears it out before returning the Node back to the Chain.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1067#note_143092
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