Added Realtek rtl8192u driver to staging - static analysis report.

[stephen at brennan.io]

> > Either way, it's not clear to me and I think the code needs cleaning 
> > up.
> > Any ideas?
> 
> 10+ year old code, yeah!!!
> 
> Just guess, who knows, no one seems to care :(

I'm at least interested in helping with cleaning the code and learning 
about the driver, maybe fixing up logical errors like this at some point.  
But I have had some trouble finding the hardware to test on. Maybe that's 
part of the issue?