staging: rtl8712: Fix unnecessary parentheses style warning

This fixes the following checkpatch.pl warning:

drivers/staging/rtl8712/rtl871x_recv.c:634 warning: Unnecessary parentheses - maybe == should be = ?
Signed-off-by: NYeliz Taneroglu <yeliztaneroglu@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl871x_recv.c

@@ -631,7 +631,7 @@ sint r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
 	rmv_len = pattrib->hdrlen + pattrib->iv_len +
 		  (bsnaphdr ? SNAP_SIZE : 0);
 	len = precvframe->u.hdr.len - rmv_len;
-	if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
+	if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 		ptr += rmv_len;
 		*ptr = 0x87;
 		*(ptr+1) = 0x12;