[patch] xstormy16::parity()

[DJ Delorie]

Sorry, this didn't need to go to the cgen list.

> The fix seemed obvious to me, but being paranoid, I even wrote a test
> program to test all 65536 values against a brute-force method.  Ok?
> 
> 	* xstormy16.cxx (parity): Fix logic.
> 
> Index: xstormy16.cxx
> ===================================================================
> RCS file: /cvs/src/src/sid/component/cgen-cpu/xstormy16/xstormy16.cxx,v