staging: r8188eu: core: remove condition never execute

Remove condition which never get execute.
as pattrib->mdata is always zero before if condition check.
Acked-by: Phillip Potter <phil@philpotter.co.uk>
Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YTNrjG1y05ByN54+@userSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme_ext.c

@@ -5669,9 +5669,6 @@ static int _issue_qos_nulldata(struct adapter *padapter, unsigned char *da, u16
 	else if ((pmlmeinfo->state & 0x03) == WIFI_FW_STATION_STATE)
 		SetToDs(fctrl);
 
-	if (pattrib->mdata)
-		SetMData(fctrl);
-
 	qc = (unsigned short *)(pframe + pattrib->hdrlen - 2);
 
 	SetPriority(qc, tid);