Modifying the ioctl(D2oddi) routine

The only changes necessary in the ioctl(D2oddi) routine are the implementation of locking:

   s = tc_tlock(tp);                    /* replacing oldspl = spl7();  */
   /*
   *
   *  Condition that is interrupt sensitive
   *  ie. conditions based on carrier change
   *
   */
   tc_tunlock(tp,s);   /* replacing splx(oldspl); */