iwlwifi: mvm: fix pointer reference when setting HE QAM thres

Pointer referencing when setting HE QAM thresholds (when nominal
packet padding bit is on) caused kernel crash due to bad
referencing. Fix that.
Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -2339,16 +2339,18 @@ static void iwl_mvm_cfg_he_sta(struct iwl_mvm *mvm,
 
 		/* Set the PPE thresholds accordingly */
 		if (low_th >= 0 && high_th >= 0) {
-			u8 ***pkt_ext_qam =
-				(void *)sta_ctxt_cmd.pkt_ext.pkt_ext_qam_th;
+			struct iwl_he_pkt_ext *pkt_ext =
+				(struct iwl_he_pkt_ext *)&sta_ctxt_cmd.pkt_ext;
 
 			for (i = 0; i < MAX_HE_SUPP_NSS; i++) {
 				u8 bw;
 
 				for (bw = 0; bw < MAX_HE_CHANNEL_BW_INDX;
 				     bw++) {
-					pkt_ext_qam[i][bw][0] = low_th;
-					pkt_ext_qam[i][bw][1] = high_th;
+					pkt_ext->pkt_ext_qam_th[i][bw][0] =
+						low_th;
+					pkt_ext->pkt_ext_qam_th[i][bw][1] =
+						high_th;
 				}
 			}