[PATCH, take 2] libertas: fix compact flash interrupt handling

[Holger Schurig]

Weird error.

However, I just seem to fix my "hard lockups". In 
if_cs_send_data() I need to call if_cs_disable_ints() / 
if_cs_enable_ints(). After I did this, I can now run "scp 
test.iso 10.2.1.4:/tmp" and "while true; do iwconfig eth1; sleep 
0.2; done" simultanously.