iwl3945: remove bogus comment

I added this comment myself, but it's clearly wrong. I had meant
to place it in iwl_mac_add_interface, which at the time didn't
honour the MAC address setting, but it does now.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -6741,8 +6741,6 @@ static int iwl3945_mac_config_interface(struct ieee80211_hw *hw,
 			return rc;
 	}
 
-	/* XXX: this MUST use conf->mac_addr */
-
 	if (!iwl3945_is_alive(priv))
 		return -EAGAIN;