mac80211: constify ieee80211_if_conf.bssid

Then one place can be a static const.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas_tf/libertas_tf.h b/drivers/net/wireless/libertas_tf/libertas_tf.h
index 8995cd7..4cc42dd 100644
--- a/drivers/net/wireless/libertas_tf/libertas_tf.h
+++ b/drivers/net/wireless/libertas_tf/libertas_tf.h
@@ -463,7 +463,7 @@
 int lbtf_update_hw_spec(struct lbtf_private *priv);
 int lbtf_cmd_set_mac_multicast_addr(struct lbtf_private *priv);
 void lbtf_set_mode(struct lbtf_private *priv, enum lbtf_mode mode);
-void lbtf_set_bssid(struct lbtf_private *priv, bool activate, u8 *bssid);
+void lbtf_set_bssid(struct lbtf_private *priv, bool activate, const u8 *bssid);
 int lbtf_set_mac_address(struct lbtf_private *priv, uint8_t *mac_addr);
 
 int lbtf_set_channel(struct lbtf_private *priv, u8 channel);