Staging: wlan-ng: p80211conv.c copy code from wlan-ng-devel branch to not drop packets

allow card to correctly receive network packets,
without this change all incoming packets are dropped.
code copied from the latest wlan-ng-devel tree.

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