mac80211: return the RSSI in dBm

For the sake of speed of calculation and number accuracy,
mac80211 tracks the RSSI in dBm * 16. But it forgot to
divide back by 16 when the RSSI is asked by the driver.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/util.c

@@ -2056,7 +2056,7 @@ int ieee80211_ave_rssi(struct ieee80211_vif *vif)
 		/* non-managed type inferfaces */
 		return 0;
 	}
-	return ifmgd->ave_beacon_signal;
+	return ifmgd->ave_beacon_signal / 16;
 }
 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);