o Initialize a local variable before referencing it. This was not

o Initialize a local variable before referencing it. This was not
  the cause of any bugs because it is *always* indirectly set
  in the for...loop, but better to be explicit about it.
o Check the magic number of the passed in thread only after it has
  been found in the active thread list. Otherwise, if the check is done
  at the very beginning we may end up pointing to garbage if the
  thread was once a valid thread, but has now been destroyed.