10145 smbios_info_boot() gets NULL check wrong

*** 19,29 ****
   * CDDL HEADER END
   */
  
  /*
   * Copyright 2015 OmniTI Computer Consulting, Inc.  All rights reserved.
!  * Copyright (c) 2017, Joyent, Inc.
   * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
--- 19,29 ----
   * CDDL HEADER END
   */
  
  /*
   * Copyright 2015 OmniTI Computer Consulting, Inc.  All rights reserved.
!  * Copyright (c) 2018, Joyent, Inc.
   * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
*** 981,997 ****
  
  id_t
  smbios_info_boot(smbios_hdl_t *shp, smbios_boot_t *bp)
  {
          const smb_struct_t *stp = smb_lookup_type(shp, SMB_TYPE_BOOT);
!         const smb_boot_t *b = (smb_boot_t *)(uintptr_t)stp->smbst_hdr;
  
          if (stp == NULL)
                  return (-1); /* errno is set for us */
  
          bzero(bp, sizeof (smbios_boot_t));
  
          bp->smbt_status = b->smbbo_status[0];
          bp->smbt_size = stp->smbst_hdr->smbh_len - sizeof (smb_boot_t);
          bp->smbt_data = bp->smbt_size ? &b->smbbo_status[1] : NULL;
  
          return (stp->smbst_hdr->smbh_hdl);
--- 981,999 ----
  
  id_t
  smbios_info_boot(smbios_hdl_t *shp, smbios_boot_t *bp)
  {
          const smb_struct_t *stp = smb_lookup_type(shp, SMB_TYPE_BOOT);
!         const smb_boot_t *b;
  
          if (stp == NULL)
                  return (-1); /* errno is set for us */
  
          bzero(bp, sizeof (smbios_boot_t));
  
+         b = (smb_boot_t *)(uintptr_t)stp->smbst_hdr;
+ 
          bp->smbt_status = b->smbbo_status[0];
          bp->smbt_size = stp->smbst_hdr->smbh_len - sizeof (smb_boot_t);
          bp->smbt_data = bp->smbt_size ? &b->smbbo_status[1] : NULL;
  
          return (stp->smbst_hdr->smbh_hdl);