> Does anyone know if there's a good coding style guideline somewhere?
> Not specifically to NetBSD or kernelcode, just in general.

Try _The Practice of Programming_, a book by Kernighan and Pike.
Addison-Wesley, February 1999, ISBN 0-201-61586-X.

If you're just talking about syntactic style (indentation, braces,
whitespace), then there's not really such thing as a "good" coding
style versus a "bad" one, although lots of people have strong
preferences and can come up with (usually not very convincing) reasons
why they're better than other conventions.  The NetBSD KNF document is
as good a choice as any; it's not specific to NetBSD or the kernel.
It's in /usr/share/misc/style on NetBSD machines.