Staging: wlan-ng: p80211wext.c add latest changes & remove extra nulls from wext_handlers

add the latest changes from wlan-ng-devel
remove 2 stray nulls from the wext_handler table introduced
by the tidy up patch.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>