iwlwifi: mvm: reduce usage of IEEE80211_SKB_CB()

There's already a variable with the result in scope, use that.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -543,9 +543,9 @@ int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
 	 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
 	 * and hence needs to be sent on the aux queue
 	 */
-	if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
+	if (skb_info->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
 	    skb_info->control.vif->type == NL80211_IFTYPE_STATION)
-		IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;
+		skb_info->hw_queue = mvm->aux_queue;
 
 	memcpy(&info, skb->cb, sizeof(info));