staging: rtl8188eu: core: Remove initialisation of return variable

Remove initialisation of return variable as it is never used.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_mlme_ext.c

@@ -5322,7 +5322,7 @@ u8 set_tx_beacon_cmd(struct adapter *padapter)
 	struct cmd_priv *pcmdpriv = &padapter->cmdpriv;
 	struct mlme_ext_priv *pmlmeext = &padapter->mlmeextpriv;
 	struct mlme_ext_info *pmlmeinfo = &pmlmeext->mlmext_info;
-	u8 res = _SUCCESS;
+	u8 res;
 	int len_diff = 0;
 
 	ph2c = kzalloc(sizeof(struct cmd_obj), GFP_ATOMIC);