Staging: rtl8192su: re-enable tx-stats

currently, interface statistics look like this:

wlan0     Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.xxx  Mask:xxx.xxx.xxx.xxx
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:435 errors:0 dropped:1 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:456758 (446.0 Kb)  TX bytes:0 (0.0 b)

after re-enabling the tx-stats it looks like this:

wlan0     Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.xxx  Mask:xxx.xxx.xxx.xxx
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1269 errors:0 dropped:1 overruns:0 frame:0
          TX packets:1049 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1667442 (1.5 Mb)  TX bytes:82606 (80.6 Kb)

Signed-off-by: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>