b43: trivial: do not report any link quality instead of invalid one

We don't want to report random quality info (new PHYs are affected).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
index b8de62c..5f812d1 100644
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -735,11 +735,13 @@
 	}
 
 	/* Link quality statistics */
-	if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
-//		s8 rssi = max(rxhdr->power0, rxhdr->power1);
-		//TODO: Find out what the rssi value is (dBm or percentage?)
-		//      and also find out what the maximum possible value is.
-		//      Fill status.ssi and status.signal fields.
+	if ((chanstat & B43_RX_CHAN_PHYTYPE) >= B43_PHYTYPE_N) {
+		/*
+		s8 rssi = max(rxhdr->power0, rxhdr->power1);
+		TODO: Find out what the rssi value is (dBm or percentage?)
+		      and also find out what the maximum possible value is.
+		      Fill status.ssi and status.signal fields.
+		*/
 	} else {
 		status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
 						  (phystat0 & B43_RX_PHYST0_OFDM),