OS-1576 Sundry uninitialised variables
Reviewed by: Robert Mustacchi <rm@joyent.com>

*** 1497,1507 ****
   * undefined, prints the token position instead.
   */
  static int
  jsfunc_lineno(uintptr_t lendsp, uintptr_t tokpos, char *buf, size_t buflen)
  {
!         uintptr_t size, bufsz, lower, upper, ii;
          uintptr_t *data;
  
          if (jsobj_is_undefined(lendsp)) {
                  /*
                   * The token position is an SMI, but it comes in as its raw
--- 1497,1507 ----
   * undefined, prints the token position instead.
   */
  static int
  jsfunc_lineno(uintptr_t lendsp, uintptr_t tokpos, char *buf, size_t buflen)
  {
!         uintptr_t size, bufsz, lower, upper, ii = 0;
          uintptr_t *data;
  
          if (jsobj_is_undefined(lendsp)) {
                  /*
                   * The token position is an SMI, but it comes in as its raw
*** 2832,2842 ****
  dcmd_v8field(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
          v8_class_t *clp;
          v8_field_t *flp;
          const char *klass, *field;
!         uintptr_t offset;
  
          /*
           * We may be invoked with either two arguments (class and field name) or
           * three (an offset to save).
           */
--- 2832,2842 ----
  dcmd_v8field(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
          v8_class_t *clp;
          v8_field_t *flp;
          const char *klass, *field;
!         uintptr_t offset = 0;
  
          /*
           * We may be invoked with either two arguments (class and field name) or
           * three (an offset to save).
           */
*** 2992,3002 ****
  
  /* ARGSUSED */
  static int
  dcmd_v8load(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
!         v8_cfg_t *cfgp, **cfgpp;
  
          if (v8_classes != NULL) {
                  mdb_warn("v8 module already configured\n");
                  return (DCMD_ERR);
          }
--- 2992,3002 ----
  
  /* ARGSUSED */
  static int
  dcmd_v8load(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
!         v8_cfg_t *cfgp = NULL, **cfgpp;
  
          if (v8_classes != NULL) {
                  mdb_warn("v8 module already configured\n");
                  return (DCMD_ERR);
          }
*** 3008,3018 ****
                  cfgp = *cfgpp;
                  if (strcmp(argv->a_un.a_str, cfgp->v8cfg_name) == 0)
                          break;
          }
  
!         if (cfgp->v8cfg_name == NULL) {
                  mdb_warn("unknown configuration: \"%s\"\n", argv->a_un.a_str);
                  return (DCMD_ERR);
          }
  
          if (autoconfigure(cfgp) == -1) {
--- 3008,3018 ----
                  cfgp = *cfgpp;
                  if (strcmp(argv->a_un.a_str, cfgp->v8cfg_name) == 0)
                          break;
          }
  
!         if (cfgp == NULL || cfgp->v8cfg_name == NULL) {
                  mdb_warn("unknown configuration: \"%s\"\n", argv->a_un.a_str);
                  return (DCMD_ERR);
          }
  
          if (autoconfigure(cfgp) == -1) {