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

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  
  /*
+  * Copyright 2017 Gary Mills
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
*** 582,592 ****
  
  static void
  show_options(const uint8_t *data, int len)
  {
          dhcpv6_option_t d6o;
!         uint_t olen, retlen;
          uint16_t val16;
          uint16_t type;
          uint32_t val32;
          const uint8_t *ostart;
          char *str, *sp;
--- 583,593 ----
  
  static void
  show_options(const uint8_t *data, int len)
  {
          dhcpv6_option_t d6o;
!         uint_t olen;
          uint16_t val16;
          uint16_t type;
          uint32_t val32;
          const uint8_t *ostart;
          char *str, *sp;
*** 764,774 ****
                          break;
                  case DHCPV6_OPT_RELAY_MSG:
                          if (olen > 0) {
                                  oldnest = prot_nest_prefix;
                                  prot_nest_prefix = prot_prefix;
!                                 retlen = interpret_dhcpv6(F_DTAIL, data, olen);
                                  prot_prefix = prot_nest_prefix;
                                  prot_nest_prefix = oldnest;
                          }
                          break;
                  case DHCPV6_OPT_AUTH: {
--- 765,775 ----
                          break;
                  case DHCPV6_OPT_RELAY_MSG:
                          if (olen > 0) {
                                  oldnest = prot_nest_prefix;
                                  prot_nest_prefix = prot_prefix;
!                                 (void) interpret_dhcpv6(F_DTAIL, data, olen);
                                  prot_prefix = prot_nest_prefix;
                                  prot_nest_prefix = oldnest;
                          }
                          break;
                  case DHCPV6_OPT_AUTH: {