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

*** 96,106 ****
  {
          uintptr_t                       cur_usb_dev;
          usba_device2devinfo_cbdata_t    *cb_data =
                              (usba_device2devinfo_cbdata_t *)cb_arg;
  
!         if ((cur_usb_dev = mdb_usba_get_usba_device(dip_addr)) == NULL) {
                  /*
                   * If there's no corresponding usba_device_t, this dip isn't
                   * a usb node.  Might be an sd node.  Ignore it.
                   */
  
--- 96,106 ----
  {
          uintptr_t                       cur_usb_dev;
          usba_device2devinfo_cbdata_t    *cb_data =
                              (usba_device2devinfo_cbdata_t *)cb_arg;
  
!         if ((cur_usb_dev = mdb_usba_get_usba_device(dip_addr)) == (uintptr_t)NULL) {
                  /*
                   * If there's no corresponding usba_device_t, this dip isn't
                   * a usb node.  Might be an sd node.  Ignore it.
                   */
  
*** 180,190 ****
   */
  int
  usba_list_walk_init(mdb_walk_state_t *wsp)
  {
          /* Must have a start addr.  */
!         if (wsp->walk_addr == NULL) {
                  mdb_warn("not a global walk.  Starting address required\n");
  
                  return (WALK_ERR);
          }
  
--- 180,190 ----
   */
  int
  usba_list_walk_init(mdb_walk_state_t *wsp)
  {
          /* Must have a start addr.  */
!         if (wsp->walk_addr == (uintptr_t)NULL) {
                  mdb_warn("not a global walk.  Starting address required\n");
  
                  return (WALK_ERR);
          }
  
*** 213,223 ****
          status = wsp->walk_callback(wsp->walk_addr, &list_entry,
              wsp->walk_cbdata);
          wsp->walk_addr = (uintptr_t)list_entry.next;
  
          /* Check if we're at the last element */
!         if (wsp->walk_addr == NULL) {
  
                  return (WALK_DONE);
          }
  
          return (status);
--- 213,223 ----
          status = wsp->walk_callback(wsp->walk_addr, &list_entry,
              wsp->walk_cbdata);
          wsp->walk_addr = (uintptr_t)list_entry.next;
  
          /* Check if we're at the last element */
!         if (wsp->walk_addr == (uintptr_t)NULL) {
  
                  return (WALK_DONE);
          }
  
          return (status);
*** 235,245 ****
   * (which address is not so easily obtainable).
   */
  int
  usb_pipe_handle_walk_init(mdb_walk_state_t *wsp)
  {
!         if (wsp->walk_addr == NULL) {
                  mdb_warn("not a global walk; usba_device_t required\n");
  
                  return (WALK_ERR);
          }
  
--- 235,245 ----
   * (which address is not so easily obtainable).
   */
  int
  usb_pipe_handle_walk_init(mdb_walk_state_t *wsp)
  {
!         if (wsp->walk_addr == (uintptr_t)NULL) {
                  mdb_warn("not a global walk; usba_device_t required\n");
  
                  return (WALK_ERR);
          }
  
*** 401,411 ****
  int
  usba_device_walk_init(mdb_walk_state_t *wsp)
  {
          usba_list_entry_t       list_entry;
  
!         if (wsp->walk_addr != NULL) {
                  mdb_warn(
                      "global walk only.  Must be invoked without an address\n");
  
                  return (WALK_ERR);
          }
--- 401,411 ----
  int
  usba_device_walk_init(mdb_walk_state_t *wsp)
  {
          usba_list_entry_t       list_entry;
  
!         if (wsp->walk_addr != (uintptr_t)NULL) {
                  mdb_warn(
                      "global walk only.  Must be invoked without an address\n");
  
                  return (WALK_ERR);
          }
*** 435,445 ****
  {
          int             status;
          char            pathname[MAXNAMELEN];
          char            dname[MODMAXNAMELEN + 1] = "<unatt>"; /* Driver name */
          char            drv_statep[MODMAXNAMELEN+ 10];
!         uint_t          usb_flag  = NULL;
          boolean_t       no_driver_attached = FALSE;
          uintptr_t       dip_addr;
          struct dev_info devinfo;
  
          if (!(flags & DCMD_ADDRSPEC)) {
--- 435,445 ----
  {
          int             status;
          char            pathname[MAXNAMELEN];
          char            dname[MODMAXNAMELEN + 1] = "<unatt>"; /* Driver name */
          char            drv_statep[MODMAXNAMELEN+ 10];
!         uint_t          usb_flag  = 0;
          boolean_t       no_driver_attached = FALSE;
          uintptr_t       dip_addr;
          struct dev_info devinfo;
  
          if (!(flags & DCMD_ADDRSPEC)) {
*** 507,517 ****
          mdb_printf("%-15s %2d   %-?p %s\n", dname, devinfo.devi_instance,
              dip_addr, pathname);
  
          if (usb_flag & USB_DUMP_VERBOSE) {
                  int             i;
!                 uintptr_t       statep = NULL;
                  char            *string_descr;
                  char            **config_cloud, **conf_str_descr;
                  usb_dev_descr_t usb_dev_descr;
                  usba_device_t   usba_device_struct;
  
--- 507,517 ----
          mdb_printf("%-15s %2d   %-?p %s\n", dname, devinfo.devi_instance,
              dip_addr, pathname);
  
          if (usb_flag & USB_DUMP_VERBOSE) {
                  int             i;
!                 uintptr_t       statep = (uintptr_t)NULL;
                  char            *string_descr;
                  char            **config_cloud, **conf_str_descr;
                  usb_dev_descr_t usb_dev_descr;
                  usba_device_t   usba_device_struct;
  
*** 715,725 ****
  
                  return (DCMD_ERR);
          }
          local_debug_buf[debug_buf_size - 1] = '\0';
  
!         if (strlen(local_debug_buf) == NULL) {
  
                  return (DCMD_OK);
          }
  
          if ((term_p = strstr(local_debug_buf, ">>>>")) == NULL) {
--- 715,725 ----
  
                  return (DCMD_ERR);
          }
          local_debug_buf[debug_buf_size - 1] = '\0';
  
!         if (strlen(local_debug_buf) == 0) {
  
                  return (DCMD_OK);
          }
  
          if ((term_p = strstr(local_debug_buf, ">>>>")) == NULL) {