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

*** 1081,1091 ****
  
                                  len = strlen(func_strs[MODE]);
                                  if ((strncmp(str, func_strs[MODE], len) == 0) &&
                                      (*(str+(len)) == '=')) {
                                      for (str = (str+(++len)), i = 0;
!                                         *str != NULL; i++, str++) {
                                                  buf[i] = *str;
  
                                      }
                                  }
                                  buf[i] = '\0';
--- 1081,1091 ----
  
                                  len = strlen(func_strs[MODE]);
                                  if ((strncmp(str, func_strs[MODE], len) == 0) &&
                                      (*(str+(len)) == '=')) {
                                      for (str = (str+(++len)), i = 0;
!                                         *str != '\0'; i++, str++) {
                                                  buf[i] = *str;
  
                                      }
                                  }
                                  buf[i] = '\0';
*** 1279,1297 ****
          DBG(1, ("find_physical_slot_names\n"));
  
          if ((root_node = di_init("/", DINFOCPYALL|DINFOPATH))
                  == DI_NODE_NIL) {
                  DBG(1, ("di_init() failed\n"));
!                 return (NULL);
          }
  
          slotarg->devpath = (char *)devcomp;
  
          if ((slotarg->promp = di_prom_init()) == DI_PROM_HANDLE_NIL) {
                  DBG(1, ("di_prom_init() failed\n"));
                  di_fini(root_node);
!                 return (NULL);
          }
  
          (void) di_walk_minor(root_node, "ddi_ctl:attachment_point:pci",
                  0, (void *)slotarg, find_slotname);
  
--- 1279,1297 ----
          DBG(1, ("find_physical_slot_names\n"));
  
          if ((root_node = di_init("/", DINFOCPYALL|DINFOPATH))
                  == DI_NODE_NIL) {
                  DBG(1, ("di_init() failed\n"));
!                 return (0);
          }
  
          slotarg->devpath = (char *)devcomp;
  
          if ((slotarg->promp = di_prom_init()) == DI_PROM_HANDLE_NIL) {
                  DBG(1, ("di_prom_init() failed\n"));
                  di_fini(root_node);
!                 return (0);
          }
  
          (void) di_walk_minor(root_node, "ddi_ctl:attachment_point:pci",
                  0, (void *)slotarg, find_slotname);