5218 posix definition of NULL
correct unistd.h and iso/stddef_iso.h
update gate source affected

*** 147,157 ****
  
                          g_op_mode |= PT_MODE_DUMP;
                          g_gui = B_FALSE;
                          dump_count = (int)strtod(optarg, &endptr);
  
!                         if (dump_count <= 0 || *endptr != NULL) {
                                  pt_usage();
                                  exit(EXIT_USAGE);
                          }
  
                          break;
--- 147,157 ----
  
                          g_op_mode |= PT_MODE_DUMP;
                          g_gui = B_FALSE;
                          dump_count = (int)strtod(optarg, &endptr);
  
!                         if (dump_count <= 0 || *endptr != '\0') {
                                  pt_usage();
                                  exit(EXIT_USAGE);
                          }
  
                          break;
*** 163,173 ****
  
                          g_op_mode |= PT_MODE_TIME;
                          interval = interval_usr = (double)strtod(optarg,
                              &endptr);
  
!                         if (*endptr != NULL || interval < 1 ||
                              interval > INTERVAL_MAX) {
                                  pt_usage();
                                  exit(EXIT_USAGE);
                          }
  
--- 163,173 ----
  
                          g_op_mode |= PT_MODE_TIME;
                          interval = interval_usr = (double)strtod(optarg,
                              &endptr);
  
!                         if (*endptr != '\0' || interval < 1 ||
                              interval > INTERVAL_MAX) {
                                  pt_usage();
                                  exit(EXIT_USAGE);
                          }