9418 iwn: rate array in struct iwn_ks_txpower should have size IWN_RIDX_MAX+1
Reviewed by: Marcel Telka <marcel@telka.sk>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Andy Fiddaman <omnios@citrus-it.co.uk>
Approved by: Dan McDonald <danmcd@joyent.com>

*** 398,408 ****
                  kstat_named_t   temp;
                  kstat_named_t   tcomp;
                  struct {
                          kstat_named_t   rf_gain;
                          kstat_named_t   dsp_gain;
!                 } rate[IWN_RIDX_MAX];
          } txchain[2];
  };
  
  struct iwn_ks_toff_2000 {
          kstat_named_t           toff_lo;
--- 398,408 ----
                  kstat_named_t   temp;
                  kstat_named_t   tcomp;
                  struct {
                          kstat_named_t   rf_gain;
                          kstat_named_t   dsp_gain;
!                 } rate[IWN_RIDX_MAX + 1];
          } txchain[2];
  };
  
  struct iwn_ks_toff_2000 {
          kstat_named_t           toff_lo;