svchost: Added base implementation of svchost (1/27)

[Juan Lang]

Hi Roy,

> The docs for HeapFree state "If this pointer is NULL, the behavior is
> undefined."  So in practice the undefined behavior is benign?

Yes.  There are tests for that, and in fact there's a janitorial
project about removing redundant NULL pointer checks before HeapFree.
Michael Stefaniuc wrote about it here:
http://www.mail-archive.com/wine-devel@winehq.org/msg11972.html
You'll still see occasional commits along those lines, often from
Michael, tagged with "found by Smatch."  E.g.:
http://www.winehq.org/pipermail/wine-cvs/2007-November/038118.html

--Juan