K 10
svn:author
V 4
avos
K 8
svn:date
V 27
2016-06-24T23:36:22.080058Z
K 7
svn:log
V 461
urtwn: fix memory leak on device restart

Free data buffers every time when device is stopped, not when
it is detached; they are allocated at the initialization stage.

How-to-reproduce:
1) ifconfig wlan0 create wlandev urtwn0 up
2) vmstat -m | grep USBdev
3) service netif restart
4) vmstat -m | grep USBdev

Also, remove usbd_transfer_drain() call; it is already called by
usbd_transfer_unsetup().

Tested with RTL8188CUS, STA mode.

Approved by:	re (marius)

END