[bug #64628] [pic] generated `lf` requests no longer set file name

[Bjarni Ingi Gislason]

Follow-up Comment #3, bug #64628 (project groff):

  Or better, change 

strcmp(s, last_filename) == 0

to

strcmp(s, last_filename) != 0


void troff_output::set_location(const char *s, int n)
{
  assert(s != 0 /* nullptr */);
  if ((s != 0 /* nullptr */) && (last_filename != 0 /* nullptr */)
      && strcmp(s, last_filename) == 0) {
    printf(".lf %d %s\n", n, s);
    char *lfn = strdup(s);
    if (0 /* nullptr */ == lfn)
      fatal("memory allocation failure while copying file name");
    last_filename = lfn;
  }
  else
    printf(".lf %d\n", n);
}



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