mac80211: remove outdated comment

This comment hasn't been a real TODO item for a long
time now since we fixed that quite a while ago.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/scan.c

@@ -12,8 +12,6 @@
  * published by the Free Software Foundation.
  */
 
-/* TODO: figure out how to avoid that the "current BSS" expires */
-
 #include <linux/wireless.h>
 #include <linux/if_arp.h>
 #include <linux/rtnetlink.h>