libertas: get current channel out of priv->curbssparams

... as priv->curbssparams won't exist once libertas+cfg80211 lands.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/assoc.h b/drivers/net/wireless/libertas/assoc.h
index 610d14c..d8c2668 100644
--- a/drivers/net/wireless/libertas/assoc.h
+++ b/drivers/net/wireless/libertas/assoc.h
@@ -36,8 +36,7 @@
 
 	/** band */
 	u8 band;
-	/** channel */
-	u8 channel;
+	/** channel is directly in priv->channel */
 	/** zero-terminated array of supported data rates */
 	u8 rates[MAX_RATES + 1];
 };