staging: rtl8188eu: remove unused function _linked_rx_signal_strehgth_display

Not referenced anymore since commit 9fe7b29c6cc1 ("staging: rtl8188eu:
remove unused field bRxRSSIDisplay in struct adapter").

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Ivan Safonov <insafonov@gmail.com>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_mlme_ext.c

@@ -4671,24 +4671,6 @@ void mlmeext_sta_del_event_callback(struct adapter *padapter)
 Following are the functions for the timer handlers
 
 *****************************************************************************/
-void _linked_rx_signal_strehgth_display(struct adapter *padapter);
-void _linked_rx_signal_strehgth_display(struct adapter *padapter)
-{
-	struct mlme_ext_priv    *pmlmeext = &padapter->mlmeextpriv;
-      struct mlme_ext_info    *pmlmeinfo = &(pmlmeext->mlmext_info);
-	u8 mac_id;
-	int UndecoratedSmoothedPWDB;
-
-	if ((pmlmeinfo->state&0x03) == WIFI_FW_STATION_STATE)
-		mac_id = 0;
-	else if ((pmlmeinfo->state&0x03) == _HW_STATE_AP_)
-		mac_id = 2;
-
-	rtw_hal_get_def_var(padapter, HW_DEF_RA_INFO_DUMP, &mac_id);
-
-	rtw_hal_get_def_var(padapter, HAL_DEF_UNDERCORATEDSMOOTHEDPWDB, &UndecoratedSmoothedPWDB);
-	DBG_88E("UndecoratedSmoothedPWDB:%d\n", UndecoratedSmoothedPWDB);
-}
 
 static u8 chk_ap_is_alive(struct adapter *padapter, struct sta_info *psta)
 {