4823 don't open-code NSEC2MSEC and MSEC2NSEC

*** 22,33 ****
  /*
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <mdb/mdb_modapi.h>
  #include <mdb/mdb_ctf.h>
  
  #include <configd.h>
  
--- 22,31 ----
*** 256,266 ****
                              "%lld.%06lld",
                              dursec, durnsec / (NANOSEC / MICROSEC));
                  else if (dursec <= 9999)
                          mdb_snprintf(durstr, sizeof (durstr),
                              "%lld.%03lld",
!                             dursec, durnsec / (NANOSEC / MILLISEC));
                  else
                          mdb_snprintf(durstr, sizeof (durstr),
                              "%lld", dursec);
          } else {
                  (void) strcpy(durstr, "-");
--- 254,264 ----
                              "%lld.%06lld",
                              dursec, durnsec / (NANOSEC / MICROSEC));
                  else if (dursec <= 9999)
                          mdb_snprintf(durstr, sizeof (durstr),
                              "%lld.%03lld",
!                             dursec, NSEC2MSEC(durnsec));
                  else
                          mdb_snprintf(durstr, sizeof (durstr),
                              "%lld", dursec);
          } else {
                  (void) strcpy(durstr, "-");
*** 280,290 ****
                              "-%lld.%06lld",
                              dursec, durnsec / (NANOSEC / MICROSEC));
                  else if (dursec <= 99999999ULL)
                          mdb_snprintf(stampstr, sizeof (stampstr),
                              "-%lld.%03lld",
!                             dursec, durnsec / (NANOSEC / MILLISEC));
                  else
                          mdb_snprintf(stampstr, sizeof (stampstr),
                              "-%lld", dursec);
          } else {
                  (void) strcpy(stampstr, "-");
--- 278,288 ----
                              "-%lld.%06lld",
                              dursec, durnsec / (NANOSEC / MICROSEC));
                  else if (dursec <= 99999999ULL)
                          mdb_snprintf(stampstr, sizeof (stampstr),
                              "-%lld.%03lld",
!                             dursec, NSEC2MSEC(durnsec));
                  else
                          mdb_snprintf(stampstr, sizeof (stampstr),
                              "-%lld", dursec);
          } else {
                  (void) strcpy(stampstr, "-");