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>

@@ -398,11 +398,11 @@
                 kstat_named_t   temp;
                 kstat_named_t   tcomp;
                 struct {
                         kstat_named_t   rf_gain;
                         kstat_named_t   dsp_gain;
-                } rate[IWN_RIDX_MAX];
+                } rate[IWN_RIDX_MAX + 1];
         } txchain[2];
 };
 
 struct iwn_ks_toff_2000 {
         kstat_named_t           toff_lo;