b43: N-PHY: determine usage of radio regulatory workaround correctly

Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/phy_n.c

@@ -191,7 +191,8 @@ static void b43_radio_init2055_post(struct b43_wldev *dev)
 				binfo->type != 0x46D ||
 				binfo->rev < 0x41);
 	else
-		workaround = ((sprom->boardflags_hi & B43_BFH_NOPA) == 0);
+		workaround =
+			!(sprom->boardflags2_lo & B43_BFL2_RXBB_INT_REG_DIS);
 
 	b43_radio_mask(dev, B2055_MASTER1, 0xFFF3);
 	if (workaround) {