iwlwifi: mvm: remove pointless NULL assignment

Assigning mvmsta to be NULL when we are about to exit the
function is pointless. Remove it. Move the variable declaration
to the scope it is used.
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

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

@@ -1472,7 +1472,6 @@ static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
 		iwl_mvm_get_agg_status(mvm, tx_resp);
 	u32 status = le16_to_cpu(agg_status->status);
 	u16 ssn = iwl_mvm_get_scd_ssn(mvm, tx_resp);
-	struct iwl_mvm_sta *mvmsta;
 	struct sk_buff_head skbs;
 	u8 skb_freed = 0;
 	u8 lq_color;
@@ -1620,7 +1619,7 @@ static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
 		goto out;
 
 	if (!IS_ERR(sta)) {
-		mvmsta = iwl_mvm_sta_from_mac80211(sta);
+		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 
 		iwl_mvm_tx_airtime(mvm, mvmsta,
 				   le16_to_cpu(tx_resp->wireless_media_time));
@@ -1683,10 +1682,7 @@ static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
 			mvmsta->next_status_eosp = false;
 			ieee80211_sta_eosp(sta);
 		}
-	} else {
-		mvmsta = NULL;
 	}
-
 out:
 	rcu_read_unlock();
 }