8485 Remove set but unused variables in usr/src/cmd

*** 1,6 ****
--- 1,7 ----
  /*
+  * Copyright 2017 Gary Mills
   * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
   *
   * Licensed under the Academic Free License version 2.1
   */
  
*** 111,121 ****
  }
  
  static char *
  pseudo_serialno_from_addr(char *name)
  {
!         int sd, rc, errnum;
          char buf[128];
          struct hostent *hp;
          struct xarpreq ar;
  
          if (name == NULL)
--- 112,122 ----
  }
  
  static char *
  pseudo_serialno_from_addr(char *name)
  {
!         int sd, errnum;
          char buf[128];
          struct hostent *hp;
          struct xarpreq ar;
  
          if (name == NULL)
*** 138,148 ****
          }
  
          sd = socket(AF_INET, SOCK_DGRAM, 0);
  
          ar.xarp_ha.sdl_family = AF_LINK;
!         rc = ioctl(sd, SIOCGXARP, (caddr_t)&ar);
  
          close(sd);
  
          if (ar.xarp_flags & ATF_COM) {  /* use the MAC address */
                  uchar_t *ea = (uchar_t *)LLADDR(&ar.xarp_ha);
--- 139,149 ----
          }
  
          sd = socket(AF_INET, SOCK_DGRAM, 0);
  
          ar.xarp_ha.sdl_family = AF_LINK;
!         (void) ioctl(sd, SIOCGXARP, (caddr_t)&ar);
  
          close(sd);
  
          if (ar.xarp_flags & ATF_COM) {  /* use the MAC address */
                  uchar_t *ea = (uchar_t *)LLADDR(&ar.xarp_ha);