Reduce branching and fix unnecessary heap allocation.

src/mtime_timedelta.c

@@ -2020,20 +2020,16 @@ getPTStringFromMS(int64_t _ms, char* PTstr)
    /*     return NULL; */
    /*   } */
 
-   if (_ms >= 0)
-     jd = newJulianDelta('+', 0, _ms); 
-   else
-     jd = newJulianDelta('-', 0, _ms);
+   jd = newJulianDelta(_ms >= 0 ? '+' : '-', 0, _ms);
 
    /* Create dummy variables for julianDeltaToTimeDelta() */
    struct _datetime* dumm_base_dt       = newDateTime(initDummyDTString);
-   struct _timedelta* dummy_td_return   = newTimeDelta(initDummyTDString);
+   struct _timedelta dummy_td;
    
    /* Get the translated TimeDelta and return the corresponding string. */
-   PTstr = timedeltaToString(julianDeltaToTimeDelta(jd, dumm_base_dt, dummy_td_return), PTstr);
+   PTstr = timedeltaToString(julianDeltaToTimeDelta(jd, dumm_base_dt, &dummy_td), PTstr);
      
    deallocateDateTime(dumm_base_dt);
-   deallocateTimeDelta(dummy_td_return);
    if(jd)
      deallocateJulianDelta(jd);