10132 smatch fixes for MDB
Reviewed by: Andy Fiddaman <andy@omniosce.org>

*** 22,32 ****
  /*
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma ident   "%Z%%M% %I%     %E% SMI"
  
  #include "ndievents.h"
  #include <sys/sunndi.h>
  #include <sys/ndi_impldefs.h>
  #include <sys/dditypes.h>
--- 22,34 ----
  /*
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! /*
!  * Copyright (c) 2018, Joyent, Inc.
!  */
  
  #include "ndievents.h"
  #include <sys/sunndi.h>
  #include <sys/ndi_impldefs.h>
  #include <sys/dditypes.h>
*** 78,88 ****
              (uintptr_t)device->devi_node_name) == -1) {
                  return (-1);
          }
  
          if (device->devi_node_state < DS_INITIALIZED) {
!                 strncpy(addr_str, '\0', sizeof ('\0'));
          } else {
                  addr = device->devi_addr;
                  if (mdb_readstr(addr_str, sizeof (addr_str),
                      (uintptr_t)addr) == -1) {
                          return (-1);
--- 80,90 ----
              (uintptr_t)device->devi_node_name) == -1) {
                  return (-1);
          }
  
          if (device->devi_node_state < DS_INITIALIZED) {
!                 addr_str[0] = '\0';
          } else {
                  addr = device->devi_addr;
                  if (mdb_readstr(addr_str, sizeof (addr_str),
                      (uintptr_t)addr) == -1) {
                          return (-1);