iwlwifi: mvm: minor rx code cleanup

Clean up variable initialisation slightly.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/iwlwifi/mvm/rx.c

@@ -346,8 +346,8 @@ void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 	/* This is fine since we don't support multiple AP interfaces */
 	sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 	if (sta) {
-		struct iwl_mvm_sta *mvmsta;
-		mvmsta = iwl_mvm_sta_from_mac80211(sta);
+		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
+
 		rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 
 		if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&