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: Johannes Berg <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

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

···
 			return rc;
 	}
 
-	/* XXX: this MUST use conf->mac_addr */
-
 	if (!iwl3945_is_alive(priv))
 		return -EAGAIN;