PDP8: Compiler warning cleanup

- Initialize local state variables to 0.  Likely non functional changes due
  to lack of depth in static analysis scan.  Coverity detects real problems
  like this.
- Fix inconsistent statement indentation.

PDP8/pdp8_dt.c

@@ -979,7 +979,7 @@ switch (fnc) {                                          /* at speed, check fnc *
                 dt_substate = DTO_WCO;
             if (((dtsa & DTA_MODE) == 0) || (M[DT_WC] == 0))
                 dtsb = dtsb | DTB_DTF;                  /* set DTF */
-                break;
+            break;
 
         case DTO_WCO: case DTO_WCO | DTO_SOB:           /* all done */
             dt_schedez (uptr, dir);                     /* sched end zone */

PDP8/pdp8_td.c

@@ -412,7 +412,7 @@ return FALSE;
 t_bool td_setpos (UNIT *uptr)
 {
 uint32 new_time, ut, ulin, udelt;
-int32 delta;
+int32 delta = 0;
 
 new_time = sim_grtime ();                               /* current time */
 ut = new_time - uptr->LASTT;                            /* elapsed time */