RTEMS | cpukit/libblock: Fixes off-by-1 and memory in flashdisk (!912)

[Chris Johns (@chris)]

Chris Johns commented on a discussion on cpukit/libblock/src/flashdisk.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/912#note_140365

 >  
 >    return RTEMS_SUCCESSFUL;
 >  }
 > +
 > +static void rtems_fdisk_cleanup_helper (rtems_flashdisk *fd, bool *mutex_initialized)
 > +{
 > +  uint32_t device;
 > +
 > +  if(fd == NULL)
 > +    return;
 > +  
 > +  if((*mutex_initialized) == false) {
 > +    (*mutex_initialized) = true;
 > +  } else {
 > +    rtems_mutex_destroy(&fd->lock);

This mutex destroy call returns a `void` so it would appear to be safe to call is the mutex is initialized or not. If this is the case then need to add a `bool` to track the mutex adds nothing to this change.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/912#note_140365
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