wl12xx: initialize rate_set on band rates initialization

In some corner cases, (invalid) 11g rates were used while
working on 11a band.

Take care of it by initializing rate_set according to the
configured band.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/main.c

@@ -2200,10 +2200,14 @@ static int wl1271_unjoin(struct wl1271 *wl)
 
 static void wl1271_set_band_rate(struct wl1271 *wl)
 {
-	if (wl->band == IEEE80211_BAND_2GHZ)
+	if (wl->band == IEEE80211_BAND_2GHZ) {
 		wl->basic_rate_set = wl->conf.tx.basic_rate;
-	else
+		wl->rate_set = wl->conf.tx.basic_rate;
+	} else {
 		wl->basic_rate_set = wl->conf.tx.basic_rate_5;
+		wl->rate_set = wl->conf.tx.basic_rate_5;
+	}
+
 }
 
 static bool wl12xx_is_roc(struct wl1271 *wl)